How did the communists gain power in russia?

"The Communist Party of the Soviet Union arose from the Bolshevik wing of the Russian Social Democratic Workers’ Party (RSDWP). The Bolsheviks, organized in 1903, were led by Vladimir I. Lenin, and they argued for a tightly disciplined organization of professional revolutionaries who were governed by democratic centralism and were dedicated to achieving the dictatorship of the proletariat. In 1917 they formally broke with the right, or Menshevik, wing of the RSDWP. In 1918, when the Bolsheviks became the ruling party of Russia, they changed their organization’s name to the All-Russian Communist Party; it was renamed the All-Union Communist Party in 1925 after the founding of the U.S.S.R. and finally to the Communist Party of the Soviet Union in 1952. "

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