[Skooz]

USSR: 20 million deaths

That is incorrect. Robert Conquest put the number at 40 million. Soviet archives have validated that number.

[colorado tanker]

Robert Conquest put the number at 40 million. Soviet archives have validated that number. Knowing they would be closely scrutized and harshly criticized (particulaly in their home country, France), the authors were quite conservative in their estimates. So, the overall estimate of 80-100 milion dead in the 20th century is likely too low. But at some point the numbers and the horror are beyond human comprehension.