Season 1

1. Owney Madden: Duke of the Westside/John 'Red' Hamilton and the Dillinger Gang

Notorious gangsters Owner "Killer" Madden and John "Red" Hamilton, who led similar lives that ended quite differently.

• ? min

2. Mickey Spillane: The Gentleman Gangster/Jimmy Coonan and the Westies Gang

Mickey Spillane, known as "the last of the gentleman gangsters,' and Jimmy Coonan, who led the much-feared Westies.

• ? min

3. Jimmy "The Gent" Burke/Danny Greene: The Celtic Warrior

Jimmy "The Gent" Burke/Danny Greene: The Celtic Warrior

• ? min

4. Frank 'Dunie' Ryan: The West End Gang/The Stopwatch Gang

Frank 'Dunie' Ryan: The West End Gang/The Stopwatch Gang

• ? min

5. Brian O'Dea/Pat Nee

Brian O'Dea/Pat Nee

• ? min

6. Frank 'The Irishman' Sheeran/Whitey Bulger

Frank 'The Irishman' Sheeran/Whitey Bulger

• ? min