A Bolshevist is a REVOLUTIONARY who advocates for socialism and communism. The term 'Bolshevist' is derived from the Russian word 'bol'shevik, ' which means 'MAJORITY.' It was used to describe the MAJORITY faction of the Russian Social Democratic Labor Party, which was led by Vladimir Lenin and Leon Trotsky. The Bolsheviks were instrumental in the October Revolution of 1917, which overthrew the Tsarist government and established the Soviet Union.