"The Russian Revolution is the collective term for a series of revolutions in Russia in 1917, which dismantled the Tsarist autocracy and led to the creation of the Russian SFSR. The Emperor was forced to abdicate and the old regime was replaced by a provisional government during the first revolution of February 1917 (March in the Gregorian calendar; the older Julian calendar was in use in Russia at the time). In the second revolution, during October, the Provisional Government was removed and replaced with a Bolshevik (Communist) government"--Wikipedia.