Jimmy Conway in Goodfellas was just one of several gangsters from the 1970s and 1980s who are at the center of Martin Scorsese's mob masterpiece. The story is told through the eyes of Henry Hill (Ray Liotta), showing his life from his days as a teenager in a working-class Italian-American neighborhood in Brooklyn to his involvement in the Lufthansa heist and his decision to work as an informant for the FBI. Henry met a lot of powerful and dangerous gangsters through the years, including Jimmy Conway (Robert De Niro), with whom he worked since he was a teenager.

https://screenrant.com/goodfellas-movie-jimmy-conway-true-story-what-happened/