The numbers for Lenin, Stalin, and Mao are way off.
A Russian friend tells me that in his Russian public school they taught him that Lenin murdered more than 20 million people, mostly Russians, in Lenin’s first five years. This was part of his plan to eliminate the bourgeoisie, most of whom were Kulaks. If any farmer owned one or more horses, he and his whole family were eliminated - from the ancient right down to babies. Of course, the horses went to the Soviet government.
Mao’s numbers are closer to 90 million, and Stalin’s are closer to 60 million.
Yeah, its hard to know for sure.
But the point is the big picture.