Looking back through oc history was there ever really a proper organised Irish Mob in USA? In New York it seemed to be just different groups of violent gangs fighting with each other for control of the early rackets. When the Commission was formed I believe Lucky Luciano tried to set them up as a single entity with his friend Owney Madden as their 'official boss'. I imagine there was too much bad blood and inter gang rivalry for this to ever work out. In later decades guys like Mickey Spillane had their own crews and didn't try and bring them all under the same banner

In Chicago you could argue that the North Side Gang under Dean O'Banion were the Irish Mob, although they certainly weren't exclusively Irish when it came to membership, especially after O'Banion's death.