Americans sometimes want to believe, even today, that Stalin didn't know what Truman meant. It's a weird thing, given we know how much intel Stalin had on the bomb, on the upcoming Trinity test, etc. Seems more plausible to me to assume he knew.https://twitter.com/GeneDannen/status/1021800799616229376 …
They knew that the Soviets had attempted espionage (at Berkeley), but they thought they had thwarted it. How wrong they were!