Answer: Bolsheviks
Explanation: Although the cause of the Russian Revolution lay in the dissatisfaction of the peoples, workers and peasants, due to the poor economic conditions and the unsolved reforms they demanded, the Bolsheviks took advantage of this situation to seize power during the Revolution. Guided by Marxist Lenin, the Bolsheviks took the lead over the rebellious people and carried out the Revolution in order to overthrow the Emperor and establish communism.