Guest Stars Greg Antonacci as Johnny Torrio Chris Caldovino as Tonino Sandrelli Dominic Chianese as Leander Cephas Whitlock Julianne Nicholson as Esther Randolph 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 Joseph Caniano as Jake Guzik John Harrington Bland as Scotty Gulliver Mike Houston as Ralph Allen Lewis Rickman as George Baxter Ned Noyes as Hank 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