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The working title of this film was City Sentinels. According to a news item in Hollywood Reporter, the film was made as the result of conferences between M-G-M studio head Louis B. Mayer's and President Herbert Hoover about the need to educate the public to have a greater respect for law enforcement officers. The film includes the following written prologue by president Herbert Hoover: "Instead of the glorification of cowardly gangsters, we need the glorification of policemen who do their duty and give their lives in public protection. If the police had the vigilant, universal backing of public opinion in their communities, if they had the implacable support of the prosecuting authorities and the courts-I am convinced that our police would stamp out the excessive crime which has disgraced some of our great cities." Other news items noted that M-G-M paid $1000 to use 250 police uniforms for the picture and that Mike Donlin was added to the cast. Donlin's participation in the released film has not been confirmed. At the end of the film, as the character Jim reaches for the hand of his younger brother Ed, Johannes Brahms' "Lullaby" was played on the picture's sound track.