Moisei Solomonovich Uritsky (Ukrainian: ; Russian: ; 2 January [O.S. 14 January] 1873 30 August 1918) was a Bolshevik revolutionary leader in Russia. After the October Revolution, he was Chief of Cheka of the Petrograd Soviet. Uritsky was assassinated by Leonid Kannegisser, a military cadet, who was executed shortly afterwards.

The Bolsheviks (Russian: Большевики, from большинство bolshinstvo, 'majority'), also known in English as the Bolshevists, were a far-left, revolutionary Marxist faction founded by Vladimir Lenin that split with the Mensheviks from the Marxist Russian Social Democratic Labour Party (RSDLP), a revolutionary socialist political party formed in 1898, at its Second Party Congress in 1903.After forming their own party in 1912, the Bolsheviks took power during the October Revolution in the Russian Republic in November 1917, overthrowing the Provisional Government of Alexander Kerensky, and became the only ruling party in the subsequent Soviet Russia and later the Soviet Union. They considered themselves the leaders of the revolutionary proletariat of Russia. Their beliefs and practices were often referred to as Bolshevism.