Mao and Stalin used state capitalism, and we've never seen a communist or socialist system. Both leaders controlled every aspect of the economies, and that's not communism or socialism. The people control the means of production and governance, and communism seeks to abolish the state entirely.

You can find this information via academic sources - I'm not making this up. Also, check out the Jakarta Method and the dirty wars in Africa and Latin America. On the CIA website, they claim their involvement in political assassinations.

We don't know so many important facts, but the information is out there. I'm not defending any of the violence, but US foreign policy (under the guise of democracy) murders millions upon millions.