After the last tsar was kicked out in Russia, the group that took over power was the Bolsheviks. Led by Vladimir Lenin, the Bolsheviks were a faction of the Russian Social Democratic Labour Party. They eventually became the Communist Party of the Soviet Union.
The Bolsheviks rose to power during the Russian Revolution of 1917, which led to the overthrow of the provisional government. Following the revolution, the Bolsheviks established a socialist government and eventually formed the Soviet Union.
The Bolsheviks' ideology was based on Marxist principles, advocating for the establishment of a socialist state where the working class held power. Their rise to power marked the beginning of the Soviet era in Russia, which had a significant impact on the country's history and global politics.