The Cheka terrorised enemies of the Bolsheviks during the Civil War and the so-called Red Terror. The Cheka was then renamed the GPU (State Political Directorate) in 1922, and then the OGPU (All-Union State Political Directorate) in 1923.
During the Red Terror 1918-1919, between 50,000 and 140,000 people were executed, and concentration camps were established on the Solevetsky Islands.
As early as December 1917, all non-Bolshevik newspapers, even those of other left wing groups, were banned.
The Kadet Party was banned and its leaders arrested.
Law courts were replaced by Revolutionary Tribunals, and the Cheka shot enemies of the Bolsheviks.