Most of the time in the USSR after Stalin's death or Communist Yugoslavia being too critical of the reigning ideology just got you fired, passed up for promotion, a failing grade on your essay, charged with what is basically hate speech (freedom of speech was constitutionally guaranteed in the USSR btw), be considered mentally ill, denied a vacation request or put you on a watch list or under surveillance by an intelligence agency.
The difference is pretty clearly of degree not kind.
But I generally agree that the bloodbaths that where Communism and National Socialism in the 20th century where much more oppressive than Democracy.
be considered mentally ill
This was essentially imprisonment and incapacitation without trial for dissenters. You got locked up and basically tortured.
I have found this most wonderful (if fairly lengthy) article, and thought you would enjoy having it brought to your attention.
It is so good, I think we should include it among the references in the "Politics is the Mind Killer" wiki page. But, before that, I submit it to you, and ask you: is there anything in this article that would warrant its exclusion from this site? I mean, besides the fact that it is about politics, and written by a notorious Social-democrat (And is that in itself grounds for exclusion?).