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The Almighty
Not really. Neither Stalin nor Mao were communists. Jesus was more of a communist. Even if you accept the 50 mill and the 70 mill it is as nothing when compared to the numbers killed in the name of christianity. 100 years to 2000 years.
Wrong as usual... but here is a list of events and estimates of the death toll for you...
http://en.wikipedia.org/wiki/List_of_wars_and_anthropogenic_disasters_by_death_toll