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'Centrolew' was a political coalition of several Polish parties (PSL Wyzwolenie, PSL Piast, Narodowa Partia Robotnicza, PPS, Stronnictwo Chłopskie and Polskie Stronnictwo Chrześcijańskiej Demokracji) after the Polish legislative election, 1928 against the ''sanacja'' and Józef Piłsudski.
To counter Centrolew, ''sanacja'' organized the Polish legislative election, 1930, and Centrolew politicians were subject to repressions before it (most famously, imprisonment in the Brest Fortress, and later the Brest trial). The Centrolew was defeated in the elections and broke up as the coalition.