Un G-man busca una célula durmiente comunista en Boston.
Alfred L. Werker
Director/a
George Murphy
Inspector James 'Jim' Belden
Finlay Currie
Professor Albert Kafer
Virginia Gilmore
Millie Zalenko aka Teresa Henning
Karel Stepanek
Alexi Laschenkov aka Gregory Anders
Louisa Horton
Elaine Wilben