Larceny on the Air (1937)

Dr. Lawrence Baxter, working with the Bureau of Pure Foods and Drugs, uses radio broadcasts to expose a number of fraudulent patient medicines, with his bitterest attacks being aimed at Kennedy Radium Products the manufacturer of a tonic called 'Radium Rejuvenating Tablets," which Baxter claims is a slow cause of death. This leads the manufacturer to try every means to defeat and discredit the young doctor.