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The Commodore (Fred Stone), an average man in an average small town, is incensed that killers and thieves are able to use legal loopholes to escape punishment. He mounts a civic crusade to bring a local gang of racketeers to justice and is aided in this endeavor by idealistic young reporter Steve (Owen Davis Jr.) -- who, fortuitously, is the sweetheart of the Commodore's granddaughter Edith (Louise Latimer). Steve and the Commodore do their job too well, and as a result end up in the gang's clutches. This 11th-hour injection of melodrama seems out of place in this otherwise leisurely programmer, but in the long run it works to the picture's benefit. Four screenwriters contributed to Grand Jury, including future Casablanca collaborator Philip G. Epstein.