There probably is some, but I doubt it's a major thing. I read somewhere that there's supposed to be an Irish crew operating from Gloucester New Jersey, but there's little substantial evidence to be found. That doesn't mean they aren't around at all, but anything as "structural" as the Mob? Don't think so.

Plenty of Irish Americans (as well as Italian Americans) on the East Coast joined outlaw motorcycle clubs.
When you take a look at the Pagans bust in Boston in 2018 most of the names were Irish, Italian or French (Canadian) and there was also a substantial number of Puerto Ricans and Laotians.