Named after the event itself, St. Valentine’s Day Massacre chronicles the Chicago gangster wars of the 1920s. The terrible true-life events of February 14, 1929 thrust gangster Al Capone into the national spotlight, but marked the beginning of the end of Chicago's criminal empire. Rival Chicago mobsters Al Capone and Bugs Moran battle for control of the city’s crime element - which leads to a bloody showdown in which Capone’s men, dressed as policeman, kill seven key members of Moran’s gang in a warehouse. Jack Nicholson makes a cameo appearance in what is one of his first screen roles.