Jack Holt
— G-Man Martin Galloway, posing as Bill Donovan
Wynne Gibson
— Alice Segar, posing as Mrs. Donovan
C. Henry Gordon
— Kilgour
Jack La Rue
— Fred Drake
Edward Brophy
— Lefty
William Pawley
— Harry Grady
Arthur Hohl
— Henchman Blackie
Robert Emmett O'Connor
— Federal Agent Jim
William Bakewell
— Dick Withers
Eleanor Stewart
— Nancy Higbee
Charles Lane
— Fingers
Frank Darien
— Dad Higbee
Lucien Prival
— Franzy
Richard Tucker
— Agency Chief Conover
George Cleveland
— Miner
Wallis Clark
— Federal Agent
Hal Taliaferro
— Federal Agent