Red Guards were paramilitary volunteer formations consisting mainly of factory workers, peasants, cossacks and partially of soldiers and sailors for "protection of the soviet power". Red Guards were a transitional military force of the collapsing Imperial Russian Army and the base formations of Bolsheviks during the October Revolution and the first months of the Russian Civil War. Most of them were formed in the time frame of the Russian Revolution of 1917, and some of the units were reorganized into the Red Army during 1918. The Red Guards formations were organized across most of the former Russian Empire, including territories outside the contemporary Russian Federation such as Finland, Poland, Estonia, Ukraine, and others. They were not centralized and were formed by decision of a local political party and local soviet members. By fighting to protect and extend the power of the Soviets, they aided the creation of a new state that would give "all power to the soviets": the Soviet Union.

The October Revolution, also known as the Great October Socialist Revolution, October coup, or Bolshevik coup 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. It took place through an armed insurrection in Petrograd on 7 November 1917 [O.S. 25 October]. It was the precipitating event of the Russian Civil War.