Goodfellas

The main character is Henry Hill (Ray Liotta), a man from New York who has always wanted to be a gangster, because he always saw the mobsters of his neighborhood and how he been treated by people. So, Henry began to mingle with the mobsters since he was a child, and they received him, ever deeper into that world.

Years later, Henry debuts with the mafia committing a robbery for Jimmy Conwaywith (Robert De Niro) with Tommy DeVito (Joe Pesci). Henry's life is exactly as I wanted, enjoying the power, spending his nights at the Copacabana with the rest of the family as one. Until one day, Tommy kills Billy Batts, a member of another of the Mafia families of New York. And this obviously will have consequences for them.