The Red Terror (krasnyj terror) in Soviet Russia was a campaign of political repression and executions which was carried out by the Bolsheviks, chiefly through the Cheka, the Bolshevik secret police. It officially started in early September 1918 and lasted until 1922.
Arising after assassination attempts on Vladimir Lenin and Petrograd Cheka leader Moisei Uritsky in retaliation for Bolshevik atrocities, the latter of which was successful, the Red Terror was modeled on the Reign of Terror of the French Revolution, and sought to eliminate political dissent, opposition, and any other threat to Bolshevik power. More broadly, the term is usually applied to Bolshevik political repression throughout the Civil War (1917–1922), as distinguished from the White Terror carried out by the White Army (Russian and non-Russian groups opposed to Bolshevik rule) against their political enemies, including the Bolsheviks.
There is no consensus among the Western historians on the number of deaths from the Red Terror. One source gives estimates of 28,000 executions per year from December 1917 to February 1922. Estimates for the number of people shot during the initial period of the Red Terror are at least 10,000. Estimates for the whole period go for a low of 50,000 to highs of 140,000 and 200,000 executed. Most estimations for the number of executions in total put the number at about 100,000.
According to Vadim Erlikhman's investigation, the number of the Red Terror's victims is at least 1,200,000 people. According to Robert Conquest, a total of 140,000 people were shot in 1917–1922, but Jonathan D. Smele estimates they were considerably fewer, "perhaps less than half that many". Candidate of Historical Sciences Nikolay Zayats states that the number of people shot by the Cheka in 1918–1922 is about 37,300 people, shot in 1918–1921 by the verdicts of the tribunals — 14,200, i.e. about 50,000–55,000 people in total, although executions and atrocities were not limited to the Cheka, having been organized by the Red Army as well.