Elenco
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
Nancy Hale
Westbrook Van Voorhis
Mary Young
Equipe
Alfred L. Werker
Director
Leo Rosten
Story
Leo Rosten
Screenplay
J. Edgar Hoover
Writer
Louis De Rochemont
Producer
Louis Applebaum
Original Music Composer
Joseph C. Brun
Director of Photography
Angelo Ross
Editor
George Stoetzel
Camera Operator
Herbert Andrews
Art Direction
Lodge Cunningham
Sound
Peter Ratkevich
Assistant Editor
Thomas Whitesell
Unit Manager
Shirlee Weingarten
Casting Director
Jack Shaindlin
Music Director
Borden Mace
Associate Producer
Lothar Wolff
Associate Producer
Edward Horton
Camera Operator