Partly. The movie drew inspiration from real events and figures, but it likely embellished and fictionalized some elements to make it more engaging for the audience.
American Gangster has its roots in a true story. It's based on the exploits of Frank Lucas, although some details might have been changed or embellished to make it more cinematic.
Yes, 'American Gangster' is rooted in truth. It tells the tale of a real criminal figure, though it may have embellished or condensed certain aspects to make it more compelling on the big screen.