The crime film is a genre where the element of crime is key the films plot. Researchers of the genre, such as Nicole Hahn Rafter and Thomas Leitch noted the difficulty in defining the genre, saying it
James Cagney and Humphrey Bogart in a promotional still for the crime film The Roaring Twenties (1939).
Richard Roundtree as John Shaft in 1973.
A gangster film or gangster movie is a film belonging to a genre that focuses on gangs and organized crime. It is a subgenre of crime film, that may involve large criminal organizations, or small gang
Crime film
…Studio System (1981) does not refer to the concept of crime film as a genre, and says that "such seemingly similar "urban crime" formulas" such as the gangster film and detective film were their own unique forms. Thomas Leitch, author of Crime Films (2004) stated that the crime film presents their defining subject…
James Cagney in The Public Enemy, 1931
Humphrey Bogart in the 1936 film, The Petrified Forest
George Raft in 1939's Invisible Stripes
Director Francis Ford Coppola, 1976