“Michael Corleone: Where does it say that you can't kill a cop? Tom Hagen: Come on, Mikey... Michael Corleone: Tom, wait a minute. I'm talking about a cop that's mixed up in drugs. I'm talking about a—a—a dishonest cop—a crooked cop who got mixed up in the rackets and got what was coming to him. That…”
— Mario Puzo, Francis Ford Coppola, Michael Corleone, Al Pacino, imdb.com