Man on a String

Man on a String is a 1960 film drama directed by Andr de Toth, loosely based on the life of Boris Morros. The film was released by Columbia Pictures and stars Ernest Borgnine and Kerwin Mathews.

Helen and Adrian Benson, a wealthy American couple with a home in Beverly Hills and a film studio, are Communist sympathizers as well, in league with Colonel Vadja Kubelov, the top KGB man in the U.S.Boriss office is bugged by his assistant, Bob Avery, a plant who is working for the Americans. Now that he has been caught redhanded, Boris is willing to turn double agent, going to Berlin in the pretense of making a documentary film there. ........

Source: Wikipedia