- HD 1080
- Runtime: 100m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Roger Corman
- Stars: Jason Robards, George Segal, Ralph Meeker, Jean Hale, Clint Ritchie
- keywords: chicago, illinois, prohibition era, crime boss, historical figure, shootout, gunfight, true crime, death, gun violence, 1920s
- Production_studio: Los Altos Productions, 20th Century Fox
- Slogan: The shocking truth about events leading up to one of the most violent days in American history!
- The The St. Valentine's Day Massacre is featured in the top rankings of 1967
- #21 in Top Crime Movies of 1967
Chicago February 14th 1929. Al Capone finally establishes himself as the city's boss of organised crime. In a north-side garage his hoods, dressed as policemen, surprise and mow down with machine-guns the key members of Bugs Moran's rival gang. The film traces the history of the incident, and the lives affected and in some cases ended by it.