Love Is on the Air (1937)

Andy McCaine is the ace crime reporter for a radio station. However, his exposés of corruption in high places gets him in trouble with the sponsor of his show, E.E. Nichols, who is in league with gangster Nicey Ferguson. Nichols pressures Andy's boss to demote him to a children's show, but Andy finds a way to use the kid show to bust open a murder case.