See the problem with this statement, aside from it being somewhat narrow minded and heavily conservative, is we have no idea what you're talking about. You see, what you're calling "communism" actually isn't communism. There is no such thing as communism, except for the ideological form. Now, are we saying that Mao killed these people, or "communism" killed these people?
No, please don't get into that Liberal garbage about, "its not true communism." Too bad, the soviet states, China, and Cuba call what they have adapted as Communism. So that's what I and the rest of the world calls it.