The Socialist Revolutionary Party, or the Party of Socialist-Revolutionaries (the SRs, СР, or Esers, эсеры, esery; Russian: Партия социалистов-революционеров, ПСР), was a major political party in late Imperial Russia, and both phases of the Russian Revolution and early Soviet Russia.. The SRs were agrarian socialists and supporters of a democratic ...

The October Revolution, officially known as the Great October Socialist Revolution under the Soviet Union, also known as the Bolshevik Revolution, was a revolution in Russia led by the Bolshevik Party of Vladimir Lenin that was a key moment in the larger Russian Revolution of 1917–1923.It was the second revolutionary change of government in Russia in 1917.