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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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.
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It's a few months after they met; Bohr and Roosevelt talked in September 1944.
