Good topic. The answer has got to be Goodfellas. It’s an immense film. But there are so many great films based on or inspired by real events. Where to start…
Midnight Express is a great film but apparently takes massive liberties with the actual events?
Raging Bull. Papillon. Badlands. Salvador. Platoon. Mississippi Burning. Zodiac was very good. I feel like i’m forgetting something really obvious. Citizen X was good too.