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> you realize that this conspiracy would have to involve dozens of people at least

The public didn't know about The Manhattan Project, either. Check out the numbers on that...

Also, you'd be shocked what people would do for millions of dollars.

The Manhattan Project started in 1942, was penetrated by Soviet spies no later than 1943 (Klaus Fuchs), and was known to the whole world by 1945. It's not a great example of extended secret-keeping.

You just need to keep it secret enough to hold out until the declassification of the documents a decade to 5 decades later.

According to documentaries, there was a whole army of spies.

From memory, one of the most important was a quadruple spy - the German gaseous diffusion expert was working for the UK, USA, Germany and Russia.

When FDR told Stalin about the bomb, Stalin just said, "Thank you."

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