Project X

Overview
Project X was one of a cycle of anti-Red films produced in the late 1940s. Keith Andes plays an ex-Communist who is strongarmed into cooperating with the Feds. Pretending to become a "comrade" again, Andes rejoins the local Communist cell. Moving about freely, he is able to track down a gang of spies who are smuggling atomic secrets. Filmed on location in New York, Project X has the surface "feel" of a documentary, though the dialogue is strictly from the funny papers. Keep an eye out for a very young Jack Lord.
Similar
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The Manchurian Candidate (1962)
The Funeral (1996)
Accident (1977)
100 Days Before the Command (1991)
Superfluous (1962)
The Photograph (1987)
The Spy Who Came In from the Cold (1965)
Dreams, Life, Death of Filip Filipović (1980)
Balkan Rules (1997)
The Motorcycle Diaries (2004)
The Lost Honor of Katharina Blum (1975)
A Thousand Years of Good Prayers (2007)
Dirty Hands (1951)
Guitar Men: The Darkest Secret of Rock 'n Roll (2007)
The Way We Were (1973)
Tail Gunner Joe (1977)
The Red Horse (1981)
Newton (2017)
Good Night, and Good Luck. (2005)