Soviet times

The "History of Soviet Russia and the Soviet Union" reflects a period of change for both Russia and the world. Though the terms "Soviet Russia" and "Soviet Union" are synonymous in everyday vocabulary, when referring to the foundations of the Soviet Union, "Soviet Russia" refers to the few years after the October Revolution of 1917, but before the creation of the Soviet Union in 1922.

The original ideology of the state was primarily based on the works of Karl Marx and Friedrich Engels. In its essence, Marx's theory stated that economic and political systems went through an inevitable evolution in form, by which the current capitalist system would be replaced by a Socialist state before achieving international cooperation and peace in a "Workers' Paradise," creating a system directed by, what Marx called, "Pure Communism."

Displeased by the relatively few changes made by the Tsar after the Russian Revolution of 1905, Russia became a hotbed of anarchism, socialism and other radical political systems. The dominant socialist party, the Russian Social Democratic Labour Party (RSDLP), subscribed to Marxist ideology. Starting in 1903 a series of splits in the party between two main leaders was escalating: the Bolsheviks (meaning "majority") led by Vladimir Lenin, and the Mensheviks (meaning minority) led by Julius Martov. Up until 1912, both groups continued to stay united under the name "RSDLP," but significant differences between Lenin and Martov thought split the party for its final time. Not only did these groups fight with each other, but also had common enemies, notably, those trying to bring the Tsar back to power. Following the February Revolution, the Mensheviks gained control of Russia and established a provisional government, but this lasted only a few months until the Bolsheviks took power in the October Revolution, also known as the Great October Socialist Revolution.

...
Wikipedia