Some regimes have murdered 10,000,000 or more people. This is more than the death toll of World War I. Three regimes have even murdered more than 20,000,000, itself more than the combat dead of World War II. No one can absorb these numbers; they are intellectually and morally indigestible. Beyond belief. By far, the media and literature on genocide and mass murder have devoted most attention to the Holocaust. But even those publicizing this particular evil seem unaware of the total murdered by Hitler and his henchmen-about 21,000,000. Moreover, aside from the Holocaust, there seems to be little general knowledge that there were even greater megamurderers. The purpose of this theme page, then, is to reference what is available on this site that deals with these truly evil regimes. I hope that thereby more attention will be devoted to them, that we learn from their bloodletting, and that their mountain of victims will be remembered and memorialized.
https://www.hawaii.edu/powerkills/MEGA.HTM
Also, see Dr. Rummel's Death by Government