The Bolsheviks grew due to their relationship with the Petrograd Soviets. The Petrograd Soviets represented the workers of Russia.
The Bolsheviks were known for their effective use of propaganda and ideology that targeted the people of Russia. This aided their growth. Their leader Lenin promised an immediate end to the war. He demanded that all banks and businesses be taken over by the workers.
The weaknesses of the Provisional Government and the non-Bolshevik parties added to the success of the Bolsheviks. By October 1917, the Bolsheviks took their chance and overthrew the Russian Provisional Government. This happened under the leadership of Lenin during the period known as the October Revolution.
The armed forces of the Bolsheviks took over the Winter Palace on 6 November, 1917 (October 25 in the Julian calendar, which was used in Russia until 1918). The Winter Palace then served as the seat of the Provisional Government located in Petrograd.
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