Something like the FBI may be needed - to pursue foreign spies, islamic terrorists, industrial espionage, illegal drug networks.
Unfortunately, leaving the FBI as presently constructed, is a FAR GREATER threat to the Constitution than all of the above, combined.
Eliminate the FBI - then rebuild new agencies with new leadership, outside of Washington DC, with much smaller, and well-defined mission.
The current FBI exists for one purpose, and it isn’t the police functions you noted: it exists to disrupt and degrade any organized opposition to the self defined Federal State.
Basically it’s the guardian of the new aristocracy - the bureaucrats and a few politicians who are seen as loyal to the bureaucracy.
The German nobility had their own hired guards who did this - harassed and intimidated any peasants who tried to organize against them. Of course so did a lot of tyrannocracies - think of the Varangian guards in Byzantium, or of course the People’s Commissariat for Internal Affairs
(NKVD). They all do it. They all know you have to do it if you want to successfully dominate people.
That’s the only real reason for its existence.
The CIA and State Dept are supposed to do what you describe in the first paragraph.
FBI is supposed to be a domestic investigation unit.
Their days of usefulness are over.
Fire 100% of them.
Eliminate the FBI - then rebuild new agencies with new leadership,…
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I called that earlier in the game. The fact many agents remained silent knowing the severity of their crimes against citizens calls for complete disbanding and rebuilding, with extreme interviewing the mid and lower levels.
Handle them like a corrupted business built on fraud. Bankrupt them, disband them, “ buy up” the departments that could be recycled- then rename them. Fact is, the three letter word FBI is disgusting, into the corrupted trash bin of American history.