[AntiGuv]

Assuming for the moment that our alternate history includes a successful completion and demonstration of the Manhattan Project, then Hitler would no doubt have completed his own crash development program at least as swiftly as the Russians did. The greatest problem that the Nazi researchers faced was that they never decided whether it was even possible (and there's reason to believe Heisenberg purposely made it appear so).

[Petronski]

That's what I said above about 'spinning quite a tale.' Plus, Stalin had the help of communist sympathizers within Manhattan to give him the a big head start. There were no 'Nazi sympathizers' among the largely Jewish Manhattan Project braintrust.