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The political bureau of the Central Committee and the most powerful political group of the Communist Party.
Central Committee of the Communist PartyThe governing body of the Party between each Congress. Conducted the day-to-day business of the Party and the government.
Congress of the CPSUThe gathering of Party delegates every five years. It was the oversight body of the entire Party, in theory.
Communist Party of the Soviet UnionThe only legal political party from 1923 until March 1990.
CPSU