The Secret Witness

Una Merkel

Lois Martin

Purnell Pratt

Capt. McGowan

Zasu Pitts

Bella

Clarence Muse

Jeff - Building Janitor

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

Maston Williams

Contact Detective

Billy Bletcher

Radio Announcer's Voice

Louis Sackin

Editor

Sam Spewack

Novel, Screenplay

Corson Jowett

Sound

Robert H. Planck

Director of Photography

Thornton Freeland

Director

J. G. Buchman

Producer