Well, I personally believe the Soviets were the biggest mass murderers in history and some of their psyops and techniques were taken by the CIA. I think this is a good summary of how the insanity accusation was abused by them.

Pointing out contradictions in the political lines of the Soviets would cause you to be branded as insane and mentally deficient, most likely tortured too. One of the first laws approved by Lenin, who was a Jesuit admirer, was the "anti-Semitism act", by which criticizing Jews was punishable by death, or time in a Gulag.