Cop Land (1997) is an American action film with an all-star cast, including Sylvester Stallone, Robert De Niro, Ray Liotta, and Harvey Keitel. (De Niro and Keitel have worked together on two previous films, Mean Streets in 1973 and Taxi Driver in 1976.) Stallone plays a hearing-impaired sheriff, and De Niro plays the lieutenant. Liotta and Keitel play detectives on opposite sides of the law. The movie is about about police corruption and vigilantism.