Frank Serpico, a New York detective, reported corrupt police officers and after being injured, continued his secret fight against corruption, reporting to Lieutenant Sullivan.

Frank Serpico was a maverick New York City detective who, after turning in a large number of "bad" cops and later being shot in the face, often went undercover to expose corruption in the city. The scruffy-looking, long-haired officer used unorthodox means to get results, and reported to Lieutenant Sullivan.—Marty McKee <[email protected]>