The writing credits on the film originally completely omitted the name of
Dalton Trumbo, who was blacklisted at the time, and read:
Screenplay by Ian McLellan Hunter and John Dighton Story by Ian McLellan Hunter
In 1991, the WGA acknowledged Dalton Trumbo's authorship of the story, granting him a posthumous "Story By" credit. The "Screenplay By" credit however was not changed.
In 2011, Tim Hunter (son of Ian McLellan Hunter) wrote a letter to John Wells, president of the WGA, asking on behalf of Christopher Trumbo (Dalton Trumbo's son), who had just passed, to petition for Trumbo to be recognized as author of the screenplay as well. The WGA further revised the credits, which have been corrected on all copies of the film released since then.
