More from the CIRCE conference, from a talk by think-tank veteran Barbara Elliott:
From 1901-1987, various governments took 207,500,000 lives.
The number of people killed by their own governments was approximately 169,000,000.
The Soviet Union killed 62,000,000. (Stalin alone: 42,000,000)
Communist China: 35,000,000.
Nazi Germany: 21,000,000