
MI5 Logo. Motto translates as "Defend the Realm"—a reflection of the
David Maxwell-Fyfe's directive for the Service to Defend the Realm
The 'Security Service', commonly known as 'MI5' (
Military Intelligence, Section 5),
[1] is the
United Kingdom's counter-intelligence and
security agency and is part of the intelligence machinery alongside the
Secret Intelligence Service (SIS or MI6),
Government Communications Headquarters (GCHQ) and the
Defence Intelligence Staff (DIS). All come under the direction of the
Joint Intelligence Committee (JIC). The service has a statutory basis in the
Security Service Act 1989 and the
UK Intelligence Services Act of 1994. Its remit includes the protection of British parliamentary
democracy and economic interests, fighting serious
crime, militant
separatism,
terrorism and
espionage within the UK. While mainly concerned with internal security, it does have an overseas role in support of the mission.
The service has had a national headquarters at
Thames House on
Millbank in
London since 1995, drawing together personnel from a number of locations into a single HQ facility. Thames House is shared with the
Northern Ireland Office and is also home to the
Joint Terrorism Analysis Centre, a subordinate organisation to the Security Service. It has been alleged that the Service has regional facilities with one claimed to be in
Glasgow.
Within the civil service community the service is colloquially known as ''Box 500'' (after its official wartime address of PO Box 500 and its current address — PO Box 3255, London
SW1P 1AE)
[2] or simply ''Five''.
Command, control and organisation
The Security Service comes under the authority of the
Home Secretary within the
Cabinet of the United Kingdom.
[Security Service Act of 1989]
The service is headed by a
Director General of the
British Civil Service who is directly supported by an internal security organisation, secretariat, legal advisory branch and information services branch. The Deputy DG is responsible for the operational activity of the service, being responsible for four branches; international counter-terrorism, National Security Advice Centre (counter proliferation and counter espionage), Irish and domestic counter-terrorism and technical and surveillance operations.
The service is subject to the direction of the Joint Intelligence Committee
[UK Intelligence Services Act of 1994]for intelligence operational priorities and liaises with the SIS, GCHQ, DIS and a number of other bodies within the British government and industrial base. The service is overseen by the Intelligence and Security Committee of Members of Parliament directly appointed by the
Prime Minister. Judicial oversight is also vested in the Interception of Communications Commissioner and the Intelligence Services Commissioner.
Operations of the service are required to be proportionate and compliant with British legislation including
Regulation of Investigatory Powers Act 2000,
Data Protection Act and various other items of legislation. The service is not subject to the provisions of the
Freedom of Information Act 2000.
The current Director General is
Jonathan Evans, who succeeded Dame
Eliza Manningham-Buller on
8 April 2007.
[3]
The service will mark its centenary in 2009 by publishing an official history, to be written by Professor Christopher Andrew, Professor of Modern and Contemporary History at
Cambridge University, to be published in hardback in 2009 by Allen Lane, an imprint of
Penguin Books.
[4]
History

Another, pre-1955 MI5 Logo
Early years
The Security Service is derived from the
Secret Service Bureau, founded in
1909 in a national climate of pre-war paranoia and possibly influenced by
invasion literature, to control secret intelligence operations in the UK and overseas, particularly concentrating on the activities of the Imperial German government as a joint initiative of the
Admiralty and the
War Office. The Bureau was split into naval and army sections which, over time, specialised in foreign target espionage and internal counter-espionage activities respectively. This specialisation was a result of the Admiralty intelligence requirements related to the maritime strength of the Imperial German Navy. This specialisation was formalised prior to 1914 and the opening of
World War I with the two sections undergoing a number of administrative changes and the home section becoming
Directorate of Military Intelligence Section 5 (MI5), the name by which it is frequently known in popular culture today.
The founding head of the Army section was Captain
Vernon Kell of the South Staffordshire Regiment, who remained in that role until the early part of the
Second World War. Its role was originally quite restricted; existing purely to ensure national security through counter-espionage. With a small staff and working in conjunction with the
Special Branch of the
Metropolitan Police the service was responsible for overall direction and the identification of foreign agents, whilst Special Branch provided the manpower for the investigation of their affairs, arrest and interrogation.
Founded in a climate of hysteria over an alleged huge German spy network the service was successful, against admittedly weak opposition, prior to the war. The service identified a total of 22 agents, 21 of whom were interned at the start of the war following a period of covert surveillance. This strategy was adopted based on the assessment that agents apprehended would likely be replaced, their identities unknown to the service. Predicated on the ability of the service to quickly apprehend the suspects success was assured by providing Kell twelve hours' notice of the outbreak of war. The arrests deprived Germany completely of reliable intelligence from within Britain.
Inter-war period
After this auspicious start, the history of MI5 becomes darker. It was consistently successful throughout the rest of the
1910s and the
1920s in its core counter-espionage role. Germany continued to attempt to infiltrate Britain throughout the war, but using a method that depended on strict control of entry and exit to the country and, crucially, large-scale inspection of mail, MI5 was easily able to identify all the agents that were dispatched. In post-war years attention turned to attempts by the
Soviet Union and the
Comintern to surreptitiously support revolutionary activities within Britain, and MI5's expertise combined with the early incompetence of the Soviets meant the bureau was successful once more in correctly identifying and closely monitoring these activities.
However, in the meantime MI5's role had been substantially enlarged. Due to the spy hysteria, MI5 was formed with far more resources than it actually needed to track down German spies. As is common within governmental bureaucracies, this meant it expanded its role in order to use its spare resources. MI5 acquired many additional responsibilities during the war. Most significantly, its strict counter-espionage role was considerably blurred. It became a much more political role, involving the surveillance not merely of foreign agents but of
pacifist and anti-
conscription organisations, and
organised labour. This was justified on the basis of the common (but mistaken) belief that foreign influence was at the root of these organisations. Thus by the end of the war MI5 was a fully-fledged secret police (although it never had the powers of arrest), in addition to being a counter-espionage agency.
This expansion of its role has continued, after a brief post-war power struggle with the head of the
Special Branch, Sir
Basil Thompson. MI5 also managed to acquire responsibility for security operations not only in Great Britain but throughout the
British Empire, and with the decline in the Empire the Security Officers based in the British High Commissions returned to London and joined the Service, which gave it a significant role in
Ireland. MI5 now has a role similar to that of the
United States'
Federal Bureau of Investigation, if not as extensive, which includes crime-prevention activities as well as political surveillance and counter-espionage. This expansion had happened almost entirely without supervision; MI5 had no responsibility to
Parliament, and was often able to act with considerable independence even from the
Cabinet and
Prime Minister. Since
1994, MI5 activities have been subject to scrutiny by Parliament's
Intelligence and Security Committee.
MI5's Irish operations during the
Anglo-Irish War were an unmitigated disaster. Its operation was penetrated by the
Irish Republican Army, and even before
Michael Collins ordered a ruthless purge of MI5's Irish agents—almost all of whom were assassinated—it was unable to provide useful intelligence on the Irish republican movement during the
Home Rule and independence controversies. {See
Cairo Gang}.
MI5's decline in counter-espionage efficiency began in the
1930s. It was to some extent a victim of its own success; it was unable to break the ways of thinking it had evolved in the 1910s and 1920s. In particular, it was entirely unable to adjust to the new methods of the
NKVD, the Russian secret intelligence organisation (later
KGB). It continued to think in terms of agents who would attempt to gather information simply through observation or bribery, or to agitate within labour organisations or the armed services, while posing as ordinary citizens.
The NKVD, however, had evolved more sophisticated methods; it began to recruit agents from within the Establishment, most notably from
Cambridge University, who were seen as a long-term investment. They succeeded in gaining positions within the Government (and, in Kim Philby's case, within British intelligence itself), from where they were much more easily able to provide the NKVD with sensitive information. The most successful of these agents—
Harold 'Kim' Philby,
Donald Maclean,
Guy Burgess,
Anthony Blunt and
John Cairncross—went undetected until after the
Second World War, and were known as the
Cambridge Five.
Second World War

Thames House's Millbank entrance, Westminster, London.
MI5 experienced further failure during the
Second World War. It was chronically unprepared, both organisationally and in terms of resources, for the outbreak of war, and utterly unequal to the task which it was assigned—the large-scale internment of enemy aliens in an attempt to uncover enemy agents. The operation was badly mishandled and contributed to the near-collapse of the agency by
1940.
One of the earliest actions of
Winston Churchill on coming to power in early 1940 was to sack the agency's long-term head, Vernon Kell. He was replaced initially by the ineffective Brigadier
A.W.A. Harker, as Acting Director General. Harker in turn was quickly replaced by
David Petrie, an
SIS man, with Harker as his deputy. With the ending of the
Battle of Britain and the abandonment of invasion plans (correctly reported by both SIS and the
Bletchley Park ULTRA project), the spy scare eased, and the internment policy was gradually reversed. This eased pressure on MI5, and allowed it to concentrate on its major wartime success, the so-called
"double-cross" system.
This was a system based on an internal memo drafted by an MI5 officer in 1936, which criticised the long-standing policy of arresting and sending to trial all enemy agents discovered by MI5. Several had offered to defect to Britain when captured; before 1939, such requests were invariably turned down. The memo advocated attempting to "turn" captured agents wherever possible, and use them to mislead enemy intelligence agencies. This suggestion was turned into a massive and well-tuned system of deception during the Second World War.
Beginning with the capture of an agent named Owens, codenamed
SNOW, MI5 began to offer enemy agents the chance to avoid prosecution (and thus the possibility of the death penalty) if they would work as British double-agents. Agents who agreed to this were supervised by MI5 in transmitting bogus "intelligence" back to the German secret service, the
Abwehr. This necessitated a large-scale organisational effort, since the information had to appear valuable but in actual fact be misleading. A high-level committee, the Wireless Board, was formed to provide this information. The day-to-day operation was delegated to a subcommittee, the Twenty Committee (so called because the Roman numerals for twenty, XX, form a
double cross).
The system was extraordinarily successful. A postwar analysis of German intelligence records found that of the 115 or so agents targeted against Britain during the war, all but one (who committed suicide) had been successfully identified and caught, with several "turned" to become double agents. The system played a major part in the massive campaign of deception which preceded the
D-Day landings, designed to give the Germans a false impression of the location and timings of the landings (see
Operation Mincemeat).
All aliens entering the country were processed at the London Reception Centre (LRC) at the Royal Patriotic School which was operated by MI5 subsection B1D, 30,000 were inspected at LRC. Captured enemy agents were taken to Camp 020,
Latchmere House, for interrogation. This was commanded by Colonel Robin Stephens. There was a Reserve Camp, Camp 020R, at
Huntercombe which was used mainly for long term detention of prisoners.
[5]
Post-war
The Prime Minister's personal responsibility for the Service was delegated to the
Home Secretary Maxwell-Fife in 1952, with a directive issued by the Home Secretary setting out the role and objectives of the Director-General. The service was subsequently placed on a statutory basis in
1989 with the introduction of the Security Service Act. This was the first government acknowledgment of the existence of the service.
The post-war period was a difficult time for the Service with a significant change in the threat as the
Cold War began, being challenged by an extremely active
KGB and increasing incidence of Irish separatism and international
terrorism. Whilst little has yet been released regarding the successes of the service there have been a number of intelligence failures which have created embarrassment for both the service and the government.
In
1983 one of its officers,
Michael Bettaney, was caught trying to sell information to the KGB. He was subsequently convicted of espionage.
The Service was instrumental in breaking up a large Soviet spy ring at the start of the
1970s, with 105 Soviet embassy staff known or suspected to be involved in intelligence activities being expelled from the country in
1971.
Controversy arose when it was alleged that the service was monitoring
trade unions and left-wing politicians; Labour Prime Minister
Harold Wilson was convinced that personnel were conspiring against him, and as Home Secretary the Labour MP
Jack Straw discovered the existence of his own file dating from his days as a
student radical.
One of the most significant and far reaching failures was an inability to conclusively detect and apprehend the "
Cambridge Five" spy ring which had formed in the inter-war years and achieved great success in penetrating the government, and the intelligence agencies themselves. Related to this failure were suggestions of a high-level penetration within the service, Peter Wright (especially in his controversal book Spy Catcher, which Britain banned) and others believing that evidence suggested the former Director-General himself,
Roger Hollis. The
Trend inquiry of 1974 cleared Hollis of that accusation, later corroborated by the former KGB officer
Oleg Gordievsky.
The Security Service's role in counter-terrorism

Thames House, London. Headquarters of the Security Service
The end of the
Cold War resulted in a change in emphasis for the operations of the service, assuming responsibility for the investigation of all
Irish republican activity on the
mainland and increasing the effort countering other forms of terrorism, particularly in more recent years the more widespread threat of Islamist extremism.
The service has been attributed with a number of successes in breaking up and monitoring extremist Islamist networks since 2001. It is also attributed with successfully infiltrating the
Provisional IRA (PIRA), with operations in conjunction with
Special Branch from various police forces leading to 21 convictions for
terrorism-related offences between
1992 and
1999. It has been suggested that this success was a significant contributor to the
Northern Ireland peace process, however this is disputed citing the success of the
IRA counter intelligence section, the
Internal Security Unit, in detecting and eliminating a number of informants.
Whilst the security forces in the province provide support in the countering of both
Republican and
Loyalist paramilitary groups since the early 1970s, Republican sources have often accused these forces of
collusion with Loyalists.
In 2006, an Irish government committee inquiry found that there was widespread collusion between British security forces and
Loyalist terrorists in the 1970s, which resulted in 18 deaths.
[6][7]
The Security Service will take responsibility for all security intelligence work in
Northern Ireland from
2007 from the
Police Service of Northern Ireland. Both
Nuala O'Loan, the Police
Ombudsman for Northern Ireland, and
Al Hutchinson, the Oversight Commissioner of the
Police Service of Northern Ireland, have expressed reservations.
With the emergence of other terrorist threats in the United Kingdom the service has increased its resource commitment to the detection and prevention of these activities. Numerous raids against suspected militants, and the internment of key suspects in
HM Prison Belmarsh in
London, have been credited to Security Service intelligence. It has been reported that Security Service officers have been involved in interrogation of British citizens interned at the
United States'
Guantanamo Bay facility in
Cuba.
Serious Crime
In
1996, legislation formalised the extension of the Security Service's statutory remit to include supporting the law enforcement agencies in their work against serious crime. The legislation aroused some controversy seen by civil libertarians as a potential evolution into a quasi-"secret police" function. Tasking was reactive, acting at the request of law enforcement bodies. This role has subsequently been passed to the
Serious Organised Crime Agency (SOCA).
Surveillance
In July 2006,
Norman Baker MP accused the British Government of "hoarding information about people who pose no danger to this country", after it emerged that MI5 holds secret files on 272,000 individuals - equivalent to one in 160 adults
[8].
It was later revealed that a "
traffic light" system operates
[9]
[10]:
★ Green – active – about 10% of files
★ Amber – enquiries prohibited, further information may be added – about 46% of files
★ Red – enquiries prohibited, substantial information may not be added – about 44% of files
Directors-General of the Security Service
Main articles: Director-General of MI5
★ 1909–1940:
Vernon Kell (from 1919, Sir Vernon Kell) (b. 1873–d. 1942)
★ 1940–1946: Sir
David Petrie (b. 1879–d. 1961)
★ 1946–1953: Sir
Percy Sillitoe (b. 1888–d. 1962)
★ 1953–1956:
Dick White (from 1955, Sir Dick White) (b. 1906–d. 1993)
★ 1956–1965:
Roger Hollis (from 1960, Sir Roger Hollis) (b. 1905–d. 1973)
★ 1965–1972:
Martin Furnival Jones (from 1967, Sir Martin Furnival Jones) (b. 1912–d. 1997)
★ 1972–1979:
Michael Hanley (from 1974, Sir Michael Hanley) (b. 1918–d. 2001)
★ 1979–1981: Sir
Howard Smith (b. 1919–d. 1996)
★ 1981–1985: Sir
John Jones (b. 1923–d. 1998)
★ 1985–1988: Sir
Anthony Duff (b. 1920–d. 2000)
★ 1988–1992:
Patrick Walker (from 1990, Sir Patrick Walker) (b. 1932)
★ 1992–1996:
Stella Rimington (f) (from 1996, Dame Stella Rimington) (b. 1935)
★ 1996–2002:
Stephen Lander (from 2000, Sir Stephen Lander) (b. 1947)
★ 2002–
21 April 2007: Honourable Dame
Eliza Manningham-Buller (f) (b. 1948)
★
21 April 2007 onwards:
Jonathan Evans [11]
Historical names of the Security Service
Although commonly referred to as "MI5", this was the Service's official name for only thirteen years (1916-29). However, as an acknowledgment of popular thought, "MI5" is used as a sub-title on the various pages of the official Security Service website (see links, below).
★ October 1909: Founded as the "Home Section of the Secret Service Bureau".
★ April 1914: Became a subsection of the War Office "Directorate of Military Operations, section 5" (MO5) - MO5(g).
★ September 1916: Became "Military Intelligence section 5" - MI5.
★ 1929: Renamed the "Defence Security Service".
★ 1931: Renamed the "Security Service".
See also
★
British Military Intelligence Systems in Northern Ireland
★
GCHQ
★
MI6
★
Special Branch
★ ''
Spooks'' — a
BBC television drama about the work of a group of MI5 officers (renamed ''MI-5'' in the United States)
★
Joint Terrorist Analysis Centre
★
CHERUB fictional organisation linked to MI5 using children as spies.
References
1. Security Service or MI5: What's in a name? on the MI5 website
2. Timothy Gerraty, ''The Irish War''
3. Security Service Mi5 gets new new Director General, publictechnology.net
4. http://www.mi5.gov.uk/output/Page232.html
5. Oliver Hoare, ''Camp 020: MI5 and the Nazi Spies - The Official History of MI5's Wartime Interrogation Centre, PRO 2000 ISBN 1-903365-08-2''
6. Irish Times article on report findings— ''The Irish Times''
7. Full Transcript of the Report
8. MI5 has secret dossiers on one in 160 adults — ''The Mail on Sunday'', 9 July, 2006.
9. Parliamentary Answer Revealing Traffic Light Coding of MI5 Files — ''Hansard'', 25 February, 1998.
10. Traffic Light Coding of MI5 Files — ''Hansard'', 5 June, 2006.
11.
★ http://www.mi5.gov.uk/output/Page65.html new page for whats in a name.
External links
★
Official Security Service website
★
MI5 Security Service Careers
★
Watching the Watchers: where MI5 gets its cars serviced
★
BBC News: Working for the security service
★
Spy