Leo Rosten (Story) · Alfred L. Werker (Director)
George Murphy
Inspector James 'Jim' Belden
Finlay Currie
Professor Albert Kafer
Virginia Gilmore
Millie / Teresa Zalenko
Karl Stepanek
Alexi Laschenkov / Gregory Anders
Louisa Horton
Mrs. Elaine Wilben
Peter Capell
Chris Zalenko / Gino
Bruno Wick
Luther Danzig
Vilma Kurer
Mrs. Rita Foss
Ann Thomas
Philadelphia Suspect
George Roy Hill
Nicholas Wilben
Karl Weber
FBI Agent Charlie Reynolds
Michael Garrett
Michael Dorndoff aka Frank Torrance
Lotte Palfi Andor
Anna Kafer
Ernest Graves
Robert Martin
Robert Carroll
Boldany
Wolfgang Zilzer
August Helmuth
Bradford Hatton
Harry Mason
Rosemary Pettit
Mrs. Martin
Eva Condon
Landlady
Steve Mitchell
Samson
John Farrell
Taxi Driver (uncredited)
Nancy Hale
Mrs. Belden (uncredited)
Westbrook Van Voorhis
Narrator (voice) (uncredited)
Mary Young
Old Lady (uncredited)
Suzanne Moulton
Sherry Belden (uncredited)
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An FBI agent works with a refugee scientist and the Coast Guard to crack a Soviet spy ring in Boston.
