"A doctor working with the Bureau of Pure Foods and Drugs, uses radio broadcasts to expose fraudulent patent medicines."
Robert Livingston
as Dr. Lawrence Baxter
Grace Bradley
as Jean Sterling
Willard Robertson
as Inspector 'Mac' McDonald
Pierre Watkin
as Kennedy
Smiley Burnette
as Jimmy
Granville Bates
as Prof. Rexford Sterling
William Newell
as Andrews
Byron Foulger
as Pete Andorka
Wilbur Mack
as F. J. Thompson
Matty Fain
as Burke
Josephine Whittell
as Nurse Nelson
Charles Timblin
as Swain
Billy Griffith
as Kellogg
William Hopper
as Announcer
Frank Du Frane
as Golden
Mary Russell
as Nurse (uncredited)
Florence Gill
as Spinster
Frank Austin
as Henchman (uncredited)
Richard Beach
Harrison Greene
as Hospital Administrator (uncredited)
John Holland
as Druggist (uncredited)
Monte Montague
William H. O'Brien
as Nightclub Waiter (uncredited)
Carleton Young
as Radio Announcer (uncredited)
Irving Pichel
Director
Endre Bohem
Screenplay
Richard English
Story
Hugo Riesenfeld
Original Music Composer
Jack A. Marta
Director of Photography