That is nothing new.
Bulger had inducted several top FBI agents in the Boston office into his gang, and used the FBI as his enforcement arm to eliminate his rivals within his own Winter Hill Gang and in the Italian La Cosa Nostra (Mafia). According to his indictment, Bulger's gang committed at least 19 murders in a spree that lasted from 1965-1994. He spent 16 years evading federal officials, some of whom may never have wanted him to have been captured alive. Two FBI agents were eventually convicted of crimes related to helping Bulger commit murder, H. Paul Rico (who died in prison in 2004) and John Connolly (who will soon be transferred from a federal prison where he's serving time for a RICO conviction to Florida to serve 40 years for a murder charge).
That is nothing new, either. The FBI's genisis was falsehood and political corruption, and that's not changed.