Maria Koszutska
Maria Koszutska was a leader and theoretician of the Polish Socialist Party "Left" faction and later of the Communist Party of Poland. She joined the PPS in 1902 and was a member of the executive of the splinter PPS-Left, and of the KPP from 1918. With interruptions, she sat on the Central Committee of the KPP 1918–29 and its Politburo 1923–29. In the KPP, Koszutska led the more moderate "majority" faction.
After 1929 she lived in the Soviet Union, working in a publishing house. She opposed the Stalinization of the KPP and the Communist International. Arrested in 1937 during Stalinist purges, accused of adherence to nationalist and Trotskyist views, she died in prison in 1939.