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The film's working title was Chicago Story, according to an March 11, 1948 Los Angeles Times article, and it was to be shot on location in Chicago. The film begins with the following written and spoken foreword: "In the cracking of many big criminal cases-such as those of the John Dillinger, Lucky Luciano and Al Capone, among others-the newspaper headlines tell only of the glamorous and sensational figures involved. But behind the headlines are the untold stories of ordinary men and women, acting with extraordinary courage. This picture concerns one of these men." This film marked James Whitmore's film debut. A May 4, 1948 Los Angeles Times news item reported that some scenes were shot at Union Station in Los Angeles. Contemporary reviews noted that this film was loosely based on the events surrounding the arrest of Al Capone. CBCS credits both Ralph Volkie and Ken Harvey with the role of "The Big Fellow."