The whimsical secret of Audrey Hepburn’s royal status may be the heart of William Wyler‘s “Roman Holiday,” but for years the romantic comedy concealed another more troubling truth: the film was missing the screenwriting credit of Dalton Trumbo, the blacklisted writer and its original author, and instead attributed his work to Ian McLellan Hunter. Now, nearly 60 years after the 1953 release of “Roman Holiday,” the Writers Guild of America, West said it had restored Trumbo’s credit following the efforts of Trumbo’s and Hunter’s sons.

Trumbo, who died in 1976, was one of 10 filmmakers – the so-called Hollywood Ten – who were cited for contempt of Congress in 1947 when they refused to testify about their political beliefs before the House Un-American Activities Committee; he served 11 months in prison and was effectively unable to continue working in the film industry. After Trumbo wrote the screenplay for “Roman Holiday” in exile in Mexico, Hunter, who was later blacklisted himself, served as a front writer, receiving the payment for the work (which he passed along to Trumbo) as well as the writing credit (which he shared with another writer, John Dighton)....