Basically what the title says. I tend to lean anarchist but I'm not opposed to reading some Soviet sympathetic literature since I like to expand my horizons.
Edit: to be more specific. Parenti describes life in the Soviet Union as largely comfortable, perhaps too comfortable. People's needs are largely met. They have economic security. Most folks are quite skeptical of the news, "I know of all these disasters happening around the world but I don't know anything that's happening in my own country" and a general disbelief in the true news about the problems in capitalist countries. This results in a disatisfaction, particularly among the intelligencia and beauracracy, that results in the top down disollution of the USSR. From there he describes shock therapy and the deprevation that resulted.
How good is his research? How good are his sources? I believe quite strongly that we live in the most sophisticated propoganda machine ever devised. That makes me skeptical of a lot of the common narratives about the USSR but more than just the US is capable of lying and I'm curious how willing Parenti is to believe in obvious falsehood.
It should be noted he does criticize the USSR but at the end of the day believes in the project of state communism.
It's estimated 27 million Russians died during WW2. OP is saying that number is attributable to Hitler. The best estimate given the revealed USSR archives, emigres, and informants puts deaths directly caused or the result of neglect attributable to Stalin is 6.5 million.
Basically the first half of the meme is anticommunist, misinformation that ignores the deaths caused by fascists.