The Union of Soviet Socialist Republics (Russian: Сою́з Сове́тских Социалисти́ческих Респу́блик, tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik; IPA: [sɐˈjʉs sɐ'vʲetskʲɪx sət͡sɨɐlʲɪs'tʲit͡ɕɪskʲɪx rʲɪsˈpublʲɪk] abbreviated to USSR (Russian:СССР, tr. SSSR) and SU (Russian: СС, tr. SS) or shortened to the Soviet Union (Russian: Сове́тский Сою́з, tr. Sovetskij Soyuz;IPA: [sɐ'vʲetskʲɪj sɐˈjʉs]), was a Stalinist state on the Eurasian continent that existed between 1922 and 1991. It was governed as a single-party state by the Communist Party with Moscow as its capital. A union of multiple subnational Soviet republics, its government and economy were highly centralized.
It operated a unique form of capitalism in which the control over capital was exercised through a state monopoly.