Once Upon a Time in America is a 1984 epic crime film co-written and directed by Italian filmmaker Sergio Leone, and starring Robert De Niro and James Woods. The film is an Italian–American venture produced by The Ladd Company, Embassy International Pictures, PSO Enterprises and Rafran Cinematografica, and distributed by Warner Bros. Based on Harry Grey's novel The Hoods, it chronicles the lives of best friends David "Noodles" Aaronson and Maximilian "Max" Bercovicz as they lead a group of Jewish ghetto youths who rise to prominence as Jewish gangsters in New York City's world of organized crime. The film explores themes of childhood friendships, love, lust, greed, betrayal, loss, and broken relationships, together with the rise of mobsters in American society.

Crime films, in the broadest sense, is a film genre inspired by and analogous to the crime fiction literary genre. Films of this genre generally involve various aspects of crime and its detection. Stylistically, the genre may overlap and combine with many other genres, such as drama or gangster film, but also include comedy, and, in turn, is divided into many sub-genres, such as mystery, suspense or noir.