Do federal law enforcement agents not have to swear to uphold the Constitution? If they are, then they are breaking their oath of office, just like His Lordship, and they should face the full consequences of such an action.
FBI oath of office
I [name] do solemnly swear (or affirm) that I will support
and defend the Constitution of the United States against all
enemies, foreign and domestic; that I will bear true faith
and allegiance to the same; that I take this obligation
freely, without any mental reservation or purpose of evasion;
and that I will well and faithfully discharge the duties of
the office on which I am about to enter. So help me God.