Excess mortality under Joseph Stalin

Estimates of the number of deaths attributable to the Soviet revolutionary and dictator Joseph Stalin vary widely. The scholarly consensus affirms that archival materials declassified in 1991 contain irrefutable data far superior to sources used prior to 1991, such as statements from emigres and other informants.

Before the dissolution of the Soviet Union and the archival revelations, some historians estimated that the numbers killed by Stalin's regime were 20 million or higher. After the Soviet Union dissolved, evidence from the Soviet archives was declassified and researchers were allowed to study it. This contained official records of 799,455 executions (1921–1953), around 1.5 to 1.7 million deaths in the Gulag, some 390,000 deaths during the dekulakization forced resettlement, and up to 400,000 deaths of persons deported during the 1940s, with a total of about 3.3 million officially recorded victims in these categories. According to historian Stephen Wheatcroft, approximately 1 million of these deaths were "purposive" while the rest happened through neglect and irresponsibility. The deaths of at least 5.5 to 6.5 million persons in the Soviet famine of 1932–1933 are sometimes included with the victims of the Stalin era.