Supposedly Khruschov said this,but it's most likely just an anecdote.
Alexandr I. Solzhenitsyn was sentenced to a tenner (10 years in the Gulag) for critical words of Stalin.
I like this:
We shall be told: what can literature possibly do against the ruthless onslaught of open violence? But let us not forget that violence does not live alone and is not capable of living alone: it is necessarily interwoven with falsehood. Between them lies the most intimate, the deepest of natural bonds. Violence finds its only refuge in falsehood, falsehood its only support in violence. Any man who has once acclaimed violence as his METHOD must inexorably choose falsehood as his PRINCIPLE. At its birth violence acts openly and even with pride. But no sooner does it become strong, firmly established, than it senses the rarefaction of the air around it and it cannot continue to exist without descending into a fog of lies, clothing them in sweet talk. It does not always, not necessarily, openly throttle the throat, more often it demands from its subjects only an oath of allegiance to falsehood, only complicity in falsehood.