Ok, I'm not going to defend that, you might be right that the great leap forward or the great famine should be mentioned. The only defense I can think of is tha

Ok, I'm not going to defend that, you might be right that the great leap forward or the great famine should be mentioned. The only defense I can think of is that neither is central to the ideology of communism, while holocaust arguably was central to nazism. But, I'm not an editor, and I agree omitting it looks a bit suspicious. I wouldn't object to writing something like "aside from theory of communism, most communist governments practiced [links to police-state, mass killings, etc. here]" into the summary.