King of the Roaring 20s: The Story of Arnold Rothstein is a 1961 American, biopic, drama, crime film directed by Joseph M. Newman, produced by Samuel Bischoff and starring David Janssen, Dianne Foster, Diana Dors and Jack Carson. The film is about the prohibition era gangster Arnold Rothstein, who rises to be a major figure in the criminal underworld. It is also known by the alternative title The Big Bankroll. It was based on a book by Leo Katcher.