re: What is the most hated federal agency to you guys?

Side of the road, middle of the night encounter with a local Deputy or other well-armed power-hungry bigot-bully. Remote location would make it even worse.

It would be much less stressful if the FBI flipped open a badge on me. Middle of the night ATF or DEA visits, often go sour really quickly.

Side issue.

I was the Officer, of regulatory contact for a drug company that made schedule 1 drugs. We were often visited by DEA agents for unannounced checks and paperwork review of batch records, test data and storage security. They always came in groups of two. We had a guy once who kept his hand (casually) on the butt of his Glock (holstered on his hip) the entire time he interviewed me on one visit.

When they left with zero problems noted I asked him when we shook hands goodby in the front office if he always did that. He smiled and said he had no idea what I was talking about. It bothered me enough that I signed a witnessed statement with our corporate lawyer and had the company retain our video tapes of him while we were together in the warehouse, etc.