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In September 1949, the Los Angeles Times reported that Universal-International had bought Daniel B. Ullman's original story "Under the Gun," which concerned a man being hunted by a prison trusty in the South. According to news items in January 1950, after a similar true-life occurrence in which a Southern trusty named C. B. Grammer shot two men alleged to have murdered three black children, Universal re-activated Ullman's shelved story and began immediate work on the production. An April 1950 Hollywood Reporter news item noted that the picture would soon begin shooting in New Orleans, but later announced that filming took place in various Florida locations, including Jacksonville and Miami. In February 1952, Los Angeles Times stated that Max Joseph Proskauer, who was cast in Under the Gun because "he looked like a convict," actually had been a fugitive at the time that he was hired, and had recently been arrested again for armed robbery. Although a May 1950 Hollywood Reporter item adds Henri Letondal to the cast, his appearance in the final film has not been confirmed.