I think that would be Pol Pot
Don't forget the Red Chinese, not to mention Rwanda Burundi in Africa. But while I am an avid consumer of statistics, I will forbare from crunching the sums and percentages to see which savages 'win' this ghastly contest.
Murdered the greatest number of people since the Nazis
I think that would be Pol Pot.
Pot was a piker, compared to Mao.
ML/NJ