The Russian Revolution of 1917 played a very important role in world history and also a major role in the history of the Baltic states of Estonia, Latvia, and Lithuania. Baltic peoples also played a major role in the 1917 Revolution, particularly the Latvian Bolsheviks who comprised a key portion of the Red Guards that defended the Bolsheviks at a crucial time in its early existence. The other was the October Revolution in which the Provisional Government was overthrown by the Bolsheviks.