I saw parts of a movie on cable like 25 years ago, it had De Niro running a gang while incarcerated in a prison or mental hospital I think?, and at one part we see Scorcese in a room editing a film?
Obscure, but answerable, I hope.
At one point in Awakenings, his character is regarded as the leader of the patients, but the part about Scorcese editing a film is something else. Maybe there’s a scene with a similar-looking actor or you’re confusing that film with another?