Final answer:
Communist revolutionaries succeeded in establishing a communist government in the Union of Soviet Socialist Republics (USSR) that persisted from 1922 to 1991.
Step-by-step explanation:
The communist revolutionaries succeeded in establishing a communist government in the Union of Soviet Socialist Republics (USSR) that persisted from 1922 to 1991.
Under the leadership of Vladimir Lenin and the Bolsheviks, the Russian Revolution of 1917 led to the overthrow of the provisional representative government and the establishment of a revolutionary socialist state based on the economic and social system of communism.
The USSR maintained a communist system at great cost, with millions killed by purges and famines caused by inefficiencies in the collectivization of agriculture and central planning.