Jack Ruby
Episode: 1x01 | Airdate: Jun 5, 2007
Season 1
Sam Giancana
Episode: 1x02 | Airdate: Jun 26, 2007
Louis Lepke
Episode: 1x03 | Airdate: Jul 3, 2007
Sammy "The Bull" Gravano
Episode: 1x04 | Airdate: Jul 10, 2007
Bugsy Siegel
Episode: 1x05 | Airdate: Jul 17, 2007
Jimmy Hoffa
Episode: 1x06 | Airdate: Jul 24, 2007
Genovese: Portrait of a Crime Family
Episode: 1x07 | Airdate: Jul 30, 2007
Frank Costello
Episode: 1x08 | Airdate: Aug 6, 2007
Joseph "The Rat" Valachi
Episode: 1x09 | Airdate: Aug 13, 2007
Meyer Lansky
Episode: 1x10 | Airdate: Aug 20, 2007
Al Capone
Episode: 1x11 | Airdate: Sep 2, 2007
Vinnie "The Chin" Gigante
Episode: 1x12 | Airdate: Sep 3, 2007
Joe Bonanno
Episode: 1x13 | Airdate: Sep 17, 2007
The Gambinos: First Family of Crime
Episode: 1x14 | Airdate: Oct 7, 2007
Henry Hill
Episode: 1x15 | Airdate: Nov 4, 2007
Lucky Luciano
Episode: 1x16 | Airdate: May 10, 2008
Whitey Bulger
Episode: 1x17 | Airdate: Jun 14, 2008
Murder, Inc.
Episode: 1x18 | Airdate: Jun 21, 2008
Tommy Lucchese
Episode: 1x19 | Airdate: Jun 28, 2008
Paul Castellano
Episode: 1x20 | Airdate: Jul 12, 2008
John Gotti
Episode: 1x21 | Airdate: Jul 19, 2008
Carlos Marcello
Episode: 1x22 | Airdate: Jul 26, 2008
Frank Lucas
Episode: 1x23 | Airdate: Oct 3, 2008
Santo Trafficante
Episode: 1x24 | Airdate: Oct 10, 2008
Mickey Cohen
Episode: 1x25 | Airdate: Oct 17, 2008
Tony Spilotro
Episode: 1x26 | Airdate: Dec 5, 2008
Mob Ladies
Episode: 1x27 | Airdate: Dec 12, 2008
Nicodemo Scarfo
Episode: 1x28 | Airdate: Dec 19, 2008
Season 2
Roy DeMeo
Episode: 2x01 | Airdate: Oct 2, 2009
Joey Gallo
Episode: 2x02 | Airdate: Dec 4, 2009
The Westies
Episode: 2x03 | Airdate: Dec 11, 2009
Nicky Barnes
Episode: 2x04 | Airdate: Dec 17, 2009
Frank Nitti
Episode: 2x05 | Airdate: Dec 18, 2009
Tony Accardo
Episode: 2x06 | Airdate: Dec 19, 2009
The Mob's Greatest Hits
Episode: 2x07 | Airdate: Dec 20, 2009
Season 3
Mafia Cops: Louis Eppolito and Stephen Caracappa
Episode: 3x01 | Airdate: Dec 3, 2010
Danny Greene
Episode: 3x02 | Airdate: Dec 10, 2010
Albert Anastasia
Episode: 3x03 | Airdate: Dec 17, 2010
Tommy "Karate" Pitera
Episode: 3x04 | Airdate: Dec 25, 2010
Anthony "Gaspipe" Casso
Episode: 3x05 | Airdate: Jan 1, 2011
"Big Joey" Massino
Episode: 3x06 | Airdate: Jan 21, 2011
Season 4
Mad Dog Sullivan
Episode: 4x01 | Airdate: Jul 13, 2012
Family Secrets
Episode: 4x02 | Airdate: Jul 20, 2012
''Mad Sam'' DeStefano
Episode: 4x03 | Airdate: Jul 27, 2012
Dutch Schultz
Episode: 4x04 | Airdate: Aug 14, 2013
The Iceman: Richard Kuklinski
Episode: 4x05 | Airdate: Aug 14, 2012
Carmine ''The Snake'' Persico
Episode: 4x06 | Airdate: Aug 21, 2012
The Grim Reaper: Greg Scarpa
Episode: 4x07 | Airdate: Aug 28, 2012
Jimmy "The Gent" Burke
Episode: 4x08 | Airdate: Sep 4, 2012