You May Be Next! (1936)

Gangster Beau Gardner (Douglass Dumbrille) runs an off-shore ship operation of jamming local radio stations broadcasts with high-frequency transmitters for extortion reasons. Radio engineer Neil Bennett (Lloyd Nolan), with the aid of roadhouse singer Fay Stevens (Ann Sothern) and the U.D. Navy and Coast Guard put an end to Gardner's transgressions.