[Steve Eisenberg]

If I'm not mistaken, the Germans were pretty close to developing an atomic weapon.

Barely started, and pretty much shut down for lack of resources before the end of the war in Europe.

True. But look how quickly the Russians, enormously helped of course by spies, got the A and then H bomb after WWII. If Eisenhower and company had failed, everything would have been different. Germany and Russia might eventually have reached a truce and cooperated once again.

[VadeRetro]

If Germany had won, we might have been looking harder at Klaus Fuchs.

[Freedom4US]

Not only espionage, but several atomic-research related devices along with a fair bit of enriched uranium or "yellowcake" iirc was included as part of our "lend lease" or outright gifting of millions of tons of essential materials to the Soviet Union during the war. The quantities are staggering by todays standards.