Special Agent K-7

Walter McGrail

Vincent 'Lanny' Landers

Queenie Smith

Ollie O'Dea

Irving Pichel

Lester Owens

Donald Reed

Billy Westrop

Willy Castello

Eddie Geller

Duncan Renaldo

Tony Blank

Joy Hodges

Peppy

Richard Tucker

Chief Agent John Adams

Malcolm McGregor

Silky Samuels

Hans Joby

Schmidt

George Eldredge

Prosecuting Attorney Ames

Henri Menjou

Smaltz

David MacDonald

Goodwin

William Royle

Police Capt. Hall

Harry Harvey

Speedy