Which blacklisted writer was credited as Millard Kaufman on Gun Crazy's screenplay?

Dalton Trumbo was the blacklisted writer credited as Millard Kaufman on Gun Crazy's screenplay.

The 1950 film was officially credited to MacKinlay Kantor and Millard Kaufman. Kaufman, however, was a front for Trumbo, who rewrote Kantor's source story into the doomed romance and crime narrative seen onscreen.

Trumbo was one of the Hollywood Ten, a group of film-industry figures who refused to answer questions about alleged Communist affiliations before the House Un-American Activities Committee. After being convicted of contempt of Congress, he continued working through pseudonyms and uncredited contributions.

The credit is easy to confuse with other blacklisted writers such as Waldo Salt, Albert Maltz, and Ring Lardner Jr. Trumbo's later public credits included Roman Holiday and The Brave One, both initially awarded under pseudonymous names.