Officer OBrien (1930)

Bill OBrien is promoted to lieutenant in the police department for his arrest of Mike Patello gang leader and racketeer for murder Ruth Dale who loves Bill is concerned when her brother Johnny who witnessed the murder proposes to testify against the racketeer Meanwhile Captain Antrim informs Bill that his father has just been released from prison and does not know his son is a policeman On the way from prison OBrien J P meets Limo a former cockney pal who recognizes Bill and keeps J P from seeing his son later J P arrives intoxicated and is enraged forcing Bill to knock him unconscious J P is arrested for robbery but returns the loot to save his son from disgrace Johnny is killed before testifying against Patello who is released but confronted by J P who proves his guilt and when he struggles with the police kills him Bill plans to resign but confident of Ruths love he decides to remain on the force