The St. Valentine's Day Massacre is a 1967 American gangster film based on the 1929 mass murder of seven members of the Northside Gang (led by George "Bugs" Moran) on orders from Al Capone. The picture was directed by Roger Corman, written by Howard Browne, and starring Jason Robards Jr. as a remarkably slender Capone, Ralph Meeker as Moran, George Segal as Peter Gusenberg, and David Canary as Frank Gusenberg.