I made a couple of one-page websites going over sources relating to controversies of socialist states. There's an unfortunate tendency to regard source collectives as individual sources, but I still thought it would be convenient to have sites you can share for when the issue is brought up for the 1000th time (for issues that can't be resolved with a single source). I've read/watched everything on the sites, so to tell me if you have any questions/suggestions.
The Tiananmen Square Protests (6-4 incident)
Yeah I'm fairly aware of the whole US backing, but it really is another one of those things. People love to talk about the mass murders under pol Pot and attribute it to communism without understanding literally who backed him and who stopped him