The St. Valentine's Day Massacre Cast and Crew
| Cast |
 Jason Robards - (Al Capone) |
 George Segal - (Peter Gusenberg) |
| Ralph Meeker - (George "Bugsy" Moran) |
| Jean Hale - (Myrtle Koppleman) |
| Clint Ritchie - ("Machine Gun" Jack McGurn) |
| Frank Silvera - (Nicholas Sorello) |
| Joseph Campanella - (Albert Weinshank) |
| Richard Bakalyan - (Scalisi) |
 Bruce Dern - (John May) |
 David Canary - (Frank Gusenberg) |
| Harold J Stone - (Frank Nitti) |
| Kurt Kreuger - (James Clark) |
| Paul Richards - (Charles Fischetti) |
| Joseph Turkel - (Guzik) |
| Milton Frome - (Adam Heyer) |
| Mickey Deems - (Reinhardt Schwimmer) |
| John Agar - (Dion O'Banion) |
| Celia Lovsky - (Josephine Schwimmer) |
| Tom Reese - (Newberry) |
| Jan Merlin - (Willie Marks) |
| Alex D'Arcy - (Giuseppe Aiello) |
| Reed Hadley - (Hymie Weiss) |
| Gus Trikonis - (Rio) |
| Charles Dierkop - (Salvanti) |
| Tom Signorelli - (Bobo Borotto) |
| Rico Cattani - (Albert Anselmi) |
 Alex Rocco - (Diamond) |
| Leo Gordon - (Heitler) |
| Director |
 Roger Corman |
| Producer |
| Roger Corman |
| Paul Rapp |
| Writer |
| Howard Browne |
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