The work of R. J. Rummel, a political science professor at the University of Hawaii, documents 169,202,000 people who were killed during the 20th century by governments practicing democide — defined as politically motivated genocide, mass murder, or other purposeful killing. According to Rummel’s scholarly research, the Soviet Union killed 61,911,000. Maoist China killed 35,236,000. The Nazis killed 20,946,000. Other smaller totalitarian dictatorships killed the rest. These numbers do not include casualties of war. All these countries were turned into gun-free-zones before the killing began.