The Irish Mob

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.

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

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

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

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

5. Brian O'Dea/Pat Nee

Brian O'Dea/Pat Nee

6. Frank 'The Irishman' Sheeran/Whitey Bulger

Frank 'The Irishman' Sheeran/Whitey Bulger