Walker, Robert L., The Human Cost of Communism in China (1971, report to the US Senate Committee of the Judiciary) “Casualties to Communism” (deaths):

1st Civil War (1927-36): .25-.5M
Fighting during Sino-Japanese War (1937-45): 50,000
2nd Civil War (1945-49): 1.25M
Land Reform prior to Liberation: 0.5-1.0M
Political liquidation campaigns: 15-30M
Korean War: 0.5-1.234M
Great Leap Forward: 1-2M
Struggle with minorities: 0.5-1.0M
Cultural Revolution: .25-.5M
Deaths in labor camps: 15-25M
TOTAL: 34.3M to 63.784M
TOTAL FOR PRC: 32M to 59.5M