According to The Black Book of Communism the total murdered by Atheist-Communist regimes approaches 100 million people. According to R.J. Rummel (author of Death By Government), the figure could exceed 250 million. There is some uncertainty over who is the worst murderer: the Soviet Union or China. The Black Book of Communism attributes roughly 20 million civilian murders to the USSR (Lenin and Stalin) and 65 million to China (Mao). R.J. Rummel credibly estimates other death counts throughout history, and he pulls no punches or otherwise minimizes the death counts from Christian and Western movements; for example the Spanish Inquisition murdered about 350,000 people.

http://theblackbook.wordpress.com/2006/11/22/excerpt-from-introduction-the-crimes-of-communism-by-stephane-courtois/

http://www.hawaii.edu/powerkills/NOTE1.HTM

No one comes closer to “Social Justice” than the Marxist Left.