WI No Soviet Spies in Manhattan Project

IIRC the Soviets managed to sneak spies into the Manhattan Project.

WI they weren't able to do that? How much would that retard Russian nuclear development, and how would it affect the Cold War?
 

hammo1j

Donor
The whole problem was Roosevelt. Remove this "fellow traveller" and you would have a total victory in Korea since the SU would not develop the bomb by 1950.

Interestingly there would have only been one U235 for Japan because one of the spies was crucial in developing the trigger for the Plutonium bomb.
 
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