HOW MANY DID COMMUNIST REGIMES MURDER?
Few would deny any longer that communism--Marxism-Leninism and its variants--meant in practice bloody terrorism, deadly purges, lethal gulags and forced labor, fatal deportations, man-made famines, extrajudicial executions and show trials, and genocide. It is also widely known that as a result millions of innocent people have been murdered in cold blood. Yet there has been virtually no concentrated statistical work on what this total might be.
https://hawaii.edu/powerkills/COM.ART.HTM