American police officers weren't big fans of Ice-T's "Cop Killer" track and expressed their displeasure in various ways when the rapper toured the country in 1992. Officers protested his Chicago concert while holding signs featuring the names of fallen colleagues. L.A. police took similar action when Ice-T played North Hollywood, with one officer going so far as to record a response track. Concerts in Pittsburgh and Philadelphia had to be canceled because local police refused to work the event.
Meanwhile, the Fraternal Order of Police, Bald Eagle Lodge 51 of Pennsylvania (which sounds like the Bookhouse Boys from Twin Peaks) were more offended by T's lyrics about women and protested the rapper coming to their state on those grounds. A local womyn's group admitted that they weren't the biggest fans of his lyrics, either, but defended his right to perform.
Nowadays you can find Ice-T playing a cop on television show Law & Order: Special Victims Unit.