soviet union
The Union of Soviet Socialist Republics (Russian: Сою́з Сове́тских Социалисти́ческих Респу́блик, tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik) abbreviated to USSR (Russian: СССР, tr. SSSR) or the Soviet Union (Russian: Советский Союз, tr. Sovetskij Soyuz), was a socialist state on the Eurasian continent that existed between 1922 and 1991, governed as a single-party state by the Communist Party with Moscow as its capital. It was the first communist country in the world.
A union of multiple subnational Soviet republics, its government and economy were highly centralized.
This tag can be applied if the image is related to the Soviet Union, such as featuring Soviet technology or the acronym CCCP.