Communist Party of the Soviet Union

The Communist Party of the Soviet Union, also shortened to CPSU, was the name of the ruling party in Russia from 1917 until 1991. As the name suggests, tt was a totalitarian communist party.

The CPSU formed out of the Bolshevik faction of the Russian Social Democratic Labour Party in 1912. As the Soviet Union wasn't officially created until 1922, the name of the party was until then the Bolshevik Russian Social Democratic Labour Party, or something to that effect. It became the Communist Party of the Soviet Union in 1922.