I am not conflating Nazis and communists. I am comparing you to a Holocaust denier because of your conspiracy theories about the existence of these places established to educate people about the well documented atrocities of the communist states. I didn't say they were as bad as the Nazis overall, I pointed out they happily used the cramped cells, torture implements, and kill rooms left behind.

It is very much not the exception in communism. I have been to almost every former Warsaw pact country and a few countries that were part of the USSR and these museums are universal.