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Absolutely the first real clue was when President Harry Truman told then Soviet Premier Josef Stalin that we had successfully tested a nuclear device, and Stalin's reaction was that of not being surprised - he already knew from Soviet spy Klaus Fuch, who was attached to the Manhattan Project and was feeding information to them.

The Soviets had also captured German scientists working on missile technology at Penemunde and the Nazi Heavy Water experiments. The information stolen from the Manhattan Project helped the Soviets accelerate their program and detonate their first weapon in 1949, just 4 years after the Trinity test at Alamogordo.

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Q: Did the Soviet Union use the knowledge they achieved from spying on the U.S. to develop their nuclear weapons?
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