The Public Enemy

The Public Enemy is a 1931 American gangster film starring James Cagney, whose portrayal of a ruthless Prohibition-era criminal became iconic and established the template for Hollywood's Depression-era crime dramas.

The film is remembered for its shocking grapefruit scene.

More broadly, a public enemy is someone considered a serious threat to society—the FBI famously designated John Dillinger "Public Enemy Number One" in 1934.