Warned of the sensitive and top-secret nature of his work, Igor is put to a test by his superiors, who have the seductive Nina Karanova (June Havoc) try her wiles on him.

Trigorin and his security chief, Ranov (Stefan Schnabel), meet with John Grubb (Berry Kroeger), the founder of Canada's branch of the Communist Party.

Because of the documents Igor took, Canada's government succeeds in dismantling the communist cabal in the country and places the Gouzenkos in protective custody and grants them residence.

Twentieth Century-Fox bought the rights to Gouzenko's articles about his experiences, as Hollywood began producing films regarding Communist infiltration in the late 1940s.

[3] In a blurb noting the movie's release, The New York Times observed: "The Iron Curtain...has been under attack since January by various groups including the National Council of American-Soviet Friendship.

"[6] The New York Times' Bosley Crowther opens his May 13, 1948, review with “Hollywood fired its first Shot in the "cold war" against Russia yesterday, just when a faint hope was glimmering that maybe moderation in fact might be achieved.

It came in the shape of The Iron Curtain,” Crowther praises Gene Tierney's “glowing” performance, but has little good to say—and a great deal to criticize—when it comes to the rest of the film.