A little nugget from the archives — Groves talked to FDR in 12/1944 about the fact that Soviets were spying on the Manhattan Project. Three things in particular are of interest to me here: (thread)pic.twitter.com/vGSLlRcNHJ
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2) That their discussion of this was mostly as a question of how transactional they can be with regards to the Soviets and "the secret." It's about the quid pro quo aspect to trading the secret for something. Again, a very different approach from later Cold War.
3) And, of course, Groves expressing to Roosevelt that he had no confidence of keeping such secrets "permanently." Just another example from the time that even high officials thought that long-term secrecy was probably impossible, and just a temporary wartime measure.
TBF, counter-intelligence didn't realize just how deeply penetrated MANHATTAN was until ASA's VENONA read Soviet wartime & 1946 spy reports in 1948 [Budianski, Code Warriors] https://books.google.com/books?id=JWgqDAAAQBAJ&printsec=frontcover&dq=Budiansky+warriors&hl=en&sa=X&ved=0ahUKEwii8tDq_cbaAhUHqlkKHbS1BZkQ6AEIJzAA#v=snippet&q=Manhattan&f=false …
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