Mao potentially killed more people than World War 2 did.
Here's one you probably didn't know: Mao ordered sparrows eradicated from China because they were capitalist. Known as the "Four Pests" campaign, Mao ordered sparrows killed because they ate the "people's" grain and didn't work for it...
The result of this campaign, ordered by the scientifically illiterate Mao, was widespread famine as crops failed because the lack of sparrows eating bugs and other pests ended with their near extinction in China. Other pests, like bed bugs flourished too. By many accounts the famine was so great that people turned to cannibalism to survive.
The lack of sparrows in China became so severe in terms of unintended consequences that the Chinese government had to import tens of thousands of sparrows from Russia to replace the ones they killed off...
Just another day in radical Leftist utopia...
Yes, I took a course in Chinese history and remember the sparrow story