FBI, CIA, just about every department is riddled with traitors.
Energy Department too. The handling of our most secret nuclear information was compromised more than once. More, Energy is one of the two departments where the Clinton people transfered to at the end of his administration.
I agree, the Beltway Augean stables need to be flushed. First, however, you have get back the Congress in order to change the laws which shield those other "career employees" who actively sabotage the very branch of government they work for from being fired. It's a major problem, especially WRT the State Department. The President can't just fire these people.