Wow, do I have to pick only 3?
I'd say IRS, DOD (aggressive components), CIA (aggressive components), FR, DHS, FDA, DEA, FCC, ICE, DOE.
I could easily rattle off 10 more that I also have big problems with, but these are the worst offenders imo.
Agencies would be better in the title, IMO.
Saying you hate them all is too easy.
Fed.
IRS.
umm... and... and.. oops.