Claim: The Communist Party of the Soviet Union was the ruling party of a socialist state.
Evidence: The Communist Party of the Soviet Union , abbreviated in English as CPSU , was the founding and ruling political party of the Union of Soviet Socialist Republics -LRB- USSR or Soviet Union -RRB-.
The Soviet Union -LRB- -LSB- Сове́тский Сою́з , r = Sovetskiy Soyuz -RSB- -LSB- sɐ ` vʲetskʲɪj sɐˈjʉs -RSB- -RRB- , officially the Union of Soviet Socialist Republics -LRB- USSR ; Сою́з Сове́тских Социалисти́ческих Респу́блик , -LSB- sɐˈjus sɐˈvʲɛtskʲɪx sətsɨəlʲɪsˈtʲitɕɪskʲɪx rʲɪˈspublʲɪk -RSB- -RRB- , also known unofficially as Russia -LRB- -LSB- Росси́я , Rossiya , rɐˈsʲijə -RSB- -RRB- , was a socialist state in Eurasia that existed from 1922 to 1991.