Not true at all. My uncle worked in the FBI and for Hoover during those years and said none of that was true.
I believed him (he’s dead now)
When you say not true, do you mean the homosexual rumors, or the claim that the KGB started the rumors?
Let me put in a rare good word for the man. He built one of the finest law enforcement agencies in history. All those rescued kidnapped kids over the years, and all the other crimes that where prevented and stopped, mean a hell of a lot more than what Hoover might have done in his private life, even if he had been homosexual.