• 
  Ry Barrett

   George Barnitz (1 episode, 2016)
• 
  Drew Moss

   Sam Cowley (1 episode, 2016)
• 
  Selena Broughton

   Anna Hughes (1 episode, 2016)
• 
  Craig Cyr

   John (1 episode)
• 
  Alex Loubert

   Ed Hollis (1 episode, 2016)
• 
  Patrick McFadden

   John Dillinger (1 episode, 2016)
• 
  Bart Rochon

   Paul Koenig (1 episode, 2016)
• 
  Kate Dickson

   Jane Morgan (1 episode, 2016)

• 
  Sheelagh Daly

   Polly Hamilton (1 episode, 2016)
• 
  Sima Sepehri

   Evelyn 'Billie' Frechette (1 episode, 2016)
• 
  Colin Price

   Melvin Purvis (1 episode, 2016)
• 
  Mathieu Burdan

   Baby Face Nelson (1 episode, 2016)
• 
  Daniel Peters

   Lincoln (1 episode, 2016)
• 
  Alysa King

   Kate Warne (1 episode, 2016)
• 
  Jessica Allen

   Isabella Sherrington (1 episode)

• 
  Alyssa DiMarco

   Bank Teller (1 episode, 2016)
• 
  Matt O'Connor

   Harry Davies (1 episode, 2016)
• 
  Drew Riedstra

   J.P. Morgan, Jr. (1 episode, 2016)
• 
  Sean Kavanaugh

   Hillard (1 episode, 2016)
• 
  Craig McCarthy

   Thomas Tunney (1 episode, 2016)
• 
  James J. Wilson

   J. Edgar Hoover (1 episode, 2016)
• 
  Ben Ball

   Thief (1 episode)
• 
  Len Greenaway

   Sheriff George Baker (1 episode, 2016)
• 
  Joe Anastasio

   Don Vito Cascio Ferro (1 episode)
• 
  Matt O'Connor

   Harry Davies (1 episode, 2016)
• 
  Will King

   Young Merchant (1 episode, 2016)
• 
  James Levesque

   Felix Manning (1 episode)
• 
  Fabio Lusvarghi

   Italian Assassin (1 episode)
• 
  Greg Zajac

   John Ashley (1 episode, 2016)
• 
  Yuri Kaplan

   Italian Gangster (1 episode)
• 
  Nick Biskupek

   Giuseppe Morello (1 episode)
• 
  Neil Bennett

   Comissioner Arthur Woods (1 episode, 2016)
• 
  David Parisian

   Guy Gaunt (1 episode, 2016)
• 
  Tracy Jennissen

   Lucy Benedetto (1 episode)
• 
  Todd Schick

   Narrator (2 episodes, 2016)
• 
  Neil Affleck

   Allan Pinkerton (1 episode, 2016)
• 
  Justin Moses

   Gangster (1 episode, 2016)
• 
  Brian Harney

   The Ox (1 episode, 2016)
• 
  Al Moran

   Joe Petrosino (1 episode, 2016)
• 
  Jimmy Capellano

   Ignazio 'The Wolf' Lupo (1 episode, 2016)
• 
  Scott Garland

   George Campbell / ... (2 episodes, 2016)
• 
  Bubba Baker

  Self
• 
  Michael Brunet

  Clarence Hurt
• 
  Chris Batchelor

  James Luckett
• 
  Werner Artinger

  Dr. Walter Scheele
• 
  Virgil Howarth

  Bonford Boniface
• 
  Julian Christopher

  John Wilkes Booth
• 
  John Migliore

  Gangster
• 
  Michael Lipka

  Harvey Pugh
• 
  Sima Sepehri

  Billie Frechette