- published: 08 Oct 2015
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The Communist Party of the Soviet Union (Russian: Коммунистическая партия Советского Союза, Kommunisticheskaya partiya Sovetskogo Soyuza; short: КПСС, KPSS) was the only legal, ruling political party in the Soviet Union and one of the largest communist organizations in the world. It lost its dominance in the wake of the failed August 1991 coup d'état attempt led by authoritarian hardliners.
The Communist Party of the Soviet Union emerged from the Bolshevik faction of the Russian Social Democratic Labour Party, under the leadership of Vladimir Lenin. The party led the 1917 October Revolution that overthrew the Russian Provisional Government and claimed to have established the world's first socialist state. Given the central role under the Constitution of the Soviet Union, the party controlled all tiers of government and social institutions in the Soviet Union. Its organization was subdivided into communist parties of the constituent Soviet republics as well as the mass youth organisation, the All-Union Leninist Young Communist League (Komsomol). The party was also the driving force of the Third International (Comintern).