MADad, Oppenheimer was not the only one on the Manhattan Project who was sympathetic to communism. While working on the Manhattan Project Klause Fuchs and Theodore Hall provided information to the Soviets about the US atomic program. A slew of physicists working for Oppenheimer at Cal Berkeley - including some whose research were foundational to the US atomic program - were active members in the CPUSA and were not able to get security clearances.
I’ll disagree with you about communism not being synonymous with the Soviets in the 1930s; they were the only game in town. The atrocities of the Soviet system - purges, gulags, famines, murders, widespread loss of any freedom, etc. - however, were not widely known yet in the West (thanks, Walter Duranty).
I fear we are taking the thread on a tangent, so I won’t write anymore about communists in the US in the 1930s and 1940s here. Feel free to message me if you want to discuss further.
Back on topic, I saw The King’s Man over the holiday, largely to have something to do while it poured outside. It was surprisingly good, with a terrific cast (Ralph Fiennes, Gemma Aterton, Djimon Hounsou, and company) and a coherent storyline. It was not a cartoonish mess like the first two Kingsmen movies.