James Cagney is a bootlegger. This is the story of his rise and fall. Warner Brothers had been producing gangster yarns since the early 30s, many featuring Cagney. But late ’30s filmmaking had become better and more watchable, with studio stalwarts like Cagney, Bogart and Frank McHugh now pros at the genre. Add in the wonderful and underrated Gladys George, and you’ve got yourself a movie! Raoul Walsh, whose career went back to silents, and who would later direct Cagney in “White Heat,” directed. “The Roaring Twenties” is part social commentary, crime movie and melodrama. And it’s one of the most entertaining movies of this genre.