Elenco - The Secret Witness
Una Merkel
Lois MartinPurnell Pratt
Capt. McGowanZasu Pitts
BellaClarence Muse
Jeff - Building JanitorPaul Hurst
Officer BranniganRalf Harolde
Lewis LeroyWilliam Collier Jr.
Arthur Jones aka CaseyNat Pendleton
Gunner - BodyguardRita La Roy
Sylvia FolsomHooper Atchley
Herbert 'Bert' FolsomJames Durkin
DetectiveMike Donlin
Mike - Speakeasy ProprietorJune Clyde
Tess JonesClyde Cook
Larson - Building EngineerGreta Granstedt
Gunner's Woman FriendHenry Hall
Police Commissioner MartinMaston Williams
Contact DetectiveBilly Bletcher
Radio Announcer's Voice