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

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

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

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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

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

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

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

5. Brian O'Dea/Pat Nee

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Brian O'Dea/Pat Nee

6. Frank 'The Irishman' Sheeran/Whitey Bulger

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Frank 'The Irishman' Sheeran/Whitey Bulger