American Hustle was based on a true story, but many details were changed to keep the film interesting. David O. Russel's 2013 drama was based on the FBI Abscam operation in the 1970s, an undercover investigation to uncover political corruption. The film begins with a disclaimer stating, "some of this actually happened," informing audiences that American Hustle is not entirely factual. Despite some made-up elements, the film received critical acclaim upon release and was nominated for 10 Academy Awards, including the coveted Best Picture award. American Hustle also won three BAFTA awards and three Golden Globes.
https://screenrant.com/american-hustle-movie-true-story-changes/