Various news outlets are reporting that Peter Strzok, FBI Deputy Assistant Director for Counterintelligence, was let go by the Mueller investigation for sending a colleague (and lover) emails outlining his disrespect for President Trump. Strzok is the same fellow who interviewed National Security Advisor Michael Flynn, catching him lying.
He also intervened to weaken the language in Director Comey's statement condemning Hillary Clinton's shoddy email practices. Taken together, these things make him a sort of all-purpose Democrat operative who coincidentally carries an FBI badge and supervises other agents.
What in the world has happened to professionalism in the Bureau? Founding Director Hoover must be rolling over in his grave.