George Murphy
Inspector James 'Jim' Belden
A G-Man searches for a communist sleeper cell in Boston.
Inspector James 'Jim' Belden
Professor Albert Kafer
Millie / Teresa Zalenko
Alexi Laschenkov / Gregory Anders
Mrs. Elaine Wilben
Chris Zalenko / Gino
Luther Danzig
Mrs. Rita Foss
Philadelphia Suspect
Nicholas Wilben
FBI Agent Charlie Reynolds
Michael Dorndoff aka Frank Torrance
Anna Kafer
Robert Martin
Boldany
August Helmuth
Harry Mason
Mrs. Martin
Landlady
Samson
Director
