The significant leader of the Bolshevik Revolution in Russia was Vladimir Lenin. He played a crucial role in the October Revolution of 1917 when the Bolsheviks overthrew the Provisional Government. Lenin's leadership was characterized by his ability to articulate the frustrations of the proletariat and his vision for a socialist state. He emphasized the need for a "vanguard" party to lead the revolution and the establishment of a dictatorship of the proletariat to achieve a classless society. Lenin's ideas and policies laid the foundation for the Soviet Union and influenced leftist movements worldwide.