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James Cagney gives a gritty performance as the little guy battling big-league corruption.  When he takes over for the former deputy of the Bureau of Weights and Measures, Johnny Cave (Cagney) butts heads with high-ranking city official Mary Cavanaugh, who is corrupt as the day is long.  Johnny is framed by Cavanaugh's office when he tries to turn in  a crooked philanthropist.  His evidence is stolen and the case falls apart.  He finds help in the nick of time from his fianc
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