The worst mass deaths under Chinese Communism occurred during the huge famine of 1959-1961. About 50 million people died who shouldn’t have died. Mass numbers of anything are hard to wrap our minds around, but essentially this was the Holocaust times 4.
I wish I could say Justice would be dispensed to the Western collaborators of totalitarian regimes, but both the Koch’s and IBM sold extensively to the Nazi’s, and only grew richer later.