1.) Goodfellas
2.)Godfather
3.) Godfater II
4.) Casino
5.) Gotti (HBO 1996 version)
6.) Donnie Brasco
7.) Bronx Tale
8.) Mean Streets
9.) Pope of Greenwich Village
10.) The Irishman (aware its highly inaccurate, but if you can look past that i thought the story was good)

Not sure if you can count Raging Bull as its not necessarily a mob movie, but there's certainly a mob aspect. If that counts, I'd put that top 5.