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

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

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

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

Brian O'Dea/Pat Nee

Frank 'The Irishman' Sheeran/Whitey Bulger