As far as irish organized crime goes, they did't even challenge the itallians for the rackets, they fell in line and started working for them, if the irish would have maintained contact with gangsters from ireland and organanized irish in all cities they would be a force, now is a good time for them to take the rackets back because the itallians are weaker and they don't want problems

"McGurn likes you, so I make you. So you are now one of us, if you fuck up, we take it out on McGurn. He is your sponsor. Fuck up, it's his ass. You work in his crew, he is your capo."