While not known as a bastion of political correctness (or personal freedoms) Austria has made it known that harboring 'wrong thoughts' and espousing 'wrong ideas' can land you in jail. From Reuters: "Historian David Irving, known for his controversial views on World War Two, has been arrested in Austria on suspicion of denying the Holocaust".
Nobody doubts that Irving is an idiot, and doesn't deserve to be called an historian. He has already been discredited, shamed and even bankrupted by sticking to his impossible revisionist view that the Holocaust never really happened. But that isn't enough for the Austrians. Denying the holocaust in Austria can get you up to 10 years in the slammer.
I wonder what the penalty is for denying that the Earth revolves around the Sun?