Guest Stars Greg Antonacci as Johnny Torrio Chris Caldovino as Tonino Sandrelli Julianne Nicholson as Esther Randolph Dominic Chianese as Leander Cephas Whitlock Meg Steedle as Billie Kent Patrick Kennedy as Dr. Douglas Mason Stephen Root as Gaston Means Arron Shiver as Dean O'Banion Kerry O'Malley as Edwina Shearer James Cromwell as Andrew William Mellon Clarke Thorell as Clifton King Co Starring Rony Clanton as Langston Christiane Seidel as Sigrid Rebecca Luker as Sister Agnes Mike Houston as Ralph Joseph Caniano as Jake Guzik John Harrington Bland as Scotty Gulliver Ned Noyes as Hank Allen Lewis Rickman as George Baxter Ryan Woodle as Phil Erin Fogel as Mary Clea Alsip as Viola Will Janowitz as Hymie Weiss Chris Cenatiempo as Scozione Timothy Sekk as Gilbert Longacre