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