I recently watched Goodfellas in its entirety (not just bits and pieces) and enjoyed it. When I first tried watching it, I thought it was really boring, but now I find great appeal to it because it shows how an "outsider" like Ray Liotta's character, who is Irish, finds community and respect with the Italian mobsters. Speaking of mob films, I still haven't seen Martin Scorcese's 2019 movie The Irishman yet; it was nominated for several Oscars a few years ago, but didn't win any.
State of Grace (also from 1990) also features an Irish-Italian mob theme. I've known about it for years, but never watched it until recently. It's about an Irish cop (Sean Penn) who goes undercover and gets caught up with an Italian mob, who fight against the Irish mob including his friends. It's really suspenseful and makes you wonder how Sean Penn is going to get out of the predicament he's in. Ed Harris and Gary Oldman are in it and they are great as well. I liked the scenes showing New York. One day I want to go there, I keep saying that.