I listen to Howie Carr (all hail Howie!), Boston talk-show guy. He's been instrumental in showing his listeners how the FBI has been corrupt way back to the sixties in their involvements with the Boston mafia and Whitey Bulger.
Mueller touches this river of corruption when he was FBI Boston office's head. According to one of the members of the Mass Parole Board, Mueller wrote a letter asking that board NOT to release four men whom the FBI had falsely imprisoned for a gang hit in order to a) protect and b) enrich one of their mafia allies. This letter has disappeared from the archives and Howie/'s looking for duplicates. The FBI KNEW from the start that these convictions had been engineered as a frame up and were false! Yet, the FBI office would never relent and help free these men.
In 2006(?), after 35 years in jail, survivors had been released and were awarded umpty-ump millions in damages for wrongful imprisonment.
The FBI has been and remains corrupt. They've lately added political corruption to street-level criminal corruption and greed. It's not just the head o'the snake: it's the snake!