They have his actual letters to Hoover kid.
You sound like a kid wishing and hoping Santa Claus is real.
Hoover is a man who claimed Martin Luther King wasn't bothered by FBI and government threats and surveilance, while MLK at the same time on FBI monitored lines is calling his friends and telling them how much pressure he is under and how close he is to being broken by the US government, the same government Marshall was a part of and working with.
Reading Thurgood Marshall’s early letters
That is Thurgood Marshall, friends with Hoover, pointing the FBI at people he considered his enemies, while he is getting protection, better treatment for what he wanted.