The Great October Socialist Revolution, or Russian Revolution, Occurs

In October 1916 the October Revolution began. It was known as the October Revolution (Октя́брьская револю́ция, Oktyabr'skaya revolyutsiya), officially known as the Great October Socialist Revolution (Вели́кая Октя́брьская социалисти́ческая револю́ция, Velikaya Oktyabr'skaya sotsialisticheskaya revolyutsiya), and commonly referred to as Red October, the October Uprising or the Bolshevik Revolution.

This seizure of state power was instrumental in the larger Russian Revolution of 1917, which took place with an armed insurrection in Petrograd (St. Petersburg) traditionally dated to 25 October 1917 (by the Julian or Old Style calendar, which corresponds to 7 November 1917 in the Gregorian or New Style calendar). 

After gaining a majority in the government, the Bolshevik party voted for Vladimir Lenin to seize power, and Bolshevik groups seized control of local governments across Russia.