Offtop:
Don't wanna fuck up and cut in with uninteresting stuff, but I just felt like saying that we - untill this day - have never seen real Communism at work. The cases in Sovjet, China and many other places around the earth have never evolved into _Communism_. A few personalities has taken advantage of the situation and created a dictatorship. Lenin, Stalin and Mao were never Communists... They just took advantage of the ideologies and tricked masses of people for their own pleasures. 
If perfect Communism had excisted it would've been pretty super. Personally I'm no communist tho. I have other opinions of how the world should be, as I have to fait in a Communist revolution/evolution. In short I'd say it's a utopia... but I still want to defend the Communist-name.
There... Hehe.
First I thought I'd agree with Marina on the Communism-Nazism issue, buuut it's just that Hitler was a little pussy compared to Stalin
Stalin have killed a hell of alot more of his own country-men than any other leader. Mao were ruthless as well, by killing off around 30 millions in hunger because he needed to melt metals for the industry. And then take nazi-germany and even _NORWAY_ for that case; Hitler didn't want to kill anyone of his own people, as long as they were blue-eyed arians. If you were white and non-jewish in Germany, you were super-safe. The germans never did anything with norwegians that didn't do anything against them. The germans came up here to "save us". They thought of us as their allies in need, it's just that we didn't want their help. Hehe. But we did fine under the war. There weren't many norwegians that died.
But yeah, the reasons for the nazis to kill people were extreme. As you say: they killed people for things they couldn't control. The jewish genocide was just insane. But that's indirectly what happened in China and Russia as well, since the normal comrade couldn't do anything with hunger caused by stupid desicions of one man or mass deaths in bloody wars. So you could say the communist countries in some ways were more free (if you weren't politically against the communist party that is, but as Marina said; if you shut your mouth that wouldn't be a problem)... but people still died heavily all over the place tho. Heh.