https://amgreatness.com/2023/08/21/the-oppenheimer-file-missing-cast-and-forgotten-back-stories/
In the early going of this marathon film, J. Robert Oppenheimer (Cillian Murphy) tells a hostile government committee that his testimony should be understood in the context of his life and work. Context also is important for movies, but Oppenheimer keeps key back stories off the screen.
Viewers see the “Hitler Invades Poland” headline from September 1, 1939, but do not see or hear anything about Josef Stalin’s Communist forces invading Poland on September 17, 1939. This joint invasion started WWII and came about because of the Stalin-Hitler pact of August 23, 1939. Viewers see nothing about the Pact, and no headline such as “Stalin Invades Finland,” marks November 30, 1939.
While the Pact was in operation, Hitler’s National Socialists (Nazis) invaded Norway, Denmark, the Netherlands, Belgium, and took over France by the summer of 1940. Under the Pact, the Nazi and Soviet intelligence forces collaborated and Stalin handed hundreds of Jewish Communists over to the Gestapo. Jewish scientists in America would have been well aware of that deadly exchange, but not a word in Oppenheimer.
Viewers never learn that for nearly the first two years of the war, Stalin and Hitler were allies. The Communist Party USA collaborated with pro-Nazi groups in America and did everything in its power to keep the United States out of the conflict. In Oppenheimer, no Communist is asked to account for what he or she did during the Pact, and why they stayed in the Party after many others left, never to return.
The Communist Party USA was founded, funded and controlled by the USSR and members pledged loyalty to the Soviet regime. Oppenheimer portrays Party members as misguided liberals concerned about the conflict in Spain. Viewers hear about “the brigades” but no character explains that the Abraham Lincoln Brigades were a Communist Party militia that opposed anti-Franco groups such as the Partido Obrero de Unificación Marxista. The POUM fighters included George Orwell, author of 1984, Animal Farm, and Homage to Catalonia. See also Cecil Eby’s Between the Bullet and the Lie.
Inquiries about Oppenheimer’s “left wing” associations fail to note that the Party had an open and secret membership, as Whittaker Chambers detailed in Witness. John Earl Haynes and Harvey Klehr cite evidence that Oppenheimer was a member of a secret Party unit at UC Berkeley, where his friend Haakon Chevalier, a professor of French literature, was an active Communist. In the movie, Jefferson Hall plays Chevalier, and Oppenheimer resists his request to pass on information to the Soviets.