> Not really, there are not. Most sources just simply do not go into details.

The question is do such details even matter. Even Stalin's communism can be disregarded if we'll start detailing it out: we can arrive at the conclusion that it was not real communism, therefore communism is good.

> The first nazi victims were pro-democratic and left wing politicians or sympathisers.

And not communists? Unless you think communism is leftwing and pro-democratic, I know there are people who think this way.