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Onset

With the October Revolution in 1917, the Bolsheviks took power from the Russian Provisional Government. The Bolsheviks established the first socialist state based on the ideas of soviet democracy and Leninism. Their newly formed federal state promised to end Russian involvement in World War I and establish a revolutionary worker's state. Lenin's government also instituted a number of progressive measures such as universal education, universal healthcare and equal rights for women. 50,000 workers had passed a resolution in favour of Bolshevik demand for transfer of power to the soviets. Following the October Revolution, the Soviet government struggled with the White Movement and several independence movements in the Russian Civil War. This period is marked by the establishment of many socialist policies and the development of new socialist ideas, with Marxism–Leninism becoming the dominant ideological strain.

In 1919, the nascent Soviet Government established the Communist Academy and the Marx–Engels–Lenin Institute for doctrinal Marxist study and to publish official ideological and research documents for the Russian Communist Party. With Lenin's death in 1924, there was an internal struggle in the Soviet Communist movement, mainly between Joseph Stalin and Leon Trotsky, in the form of the Right Opposition and Left Opposition, respectively. These struggles were based on both sides' different interpretations of Marxist and Leninist theory based on the situation of the Soviet Union at the time.