Générique complet
The Secret Witness
Una Merkel
Lois Martin
Purnell Pratt
Capt. McGowan
Zasu Pitts
Bella
Clarence Muse
Jeff - Building Janitor
PH
Paul Hurst
Officer Brannigan
Ralf Harolde
Lewis Leroy
William Collier Jr.
Arthur Jones aka Casey
Nat Pendleton
Gunner - Bodyguard
Rita La Roy
Sylvia Folsom
Hooper Atchley
Herbert 'Bert' Folsom
James Durkin
Detective
Mike Donlin
Mike - Speakeasy Proprietor
June Clyde
Tess Jones
Clyde Cook
Larson - Building Engineer
Greta Granstedt
Gunner's Woman Friend
Henry Hall
Police Commissioner Martin
MW
Maston Williams
Contact Detective
Billy Bletcher
Radio Announcer's Voice
