Conspiracy: 'The CIA and the Nazis' reveals a CIA program known as Operation Paperclip, about how 4000 former Nazis worked with the US Government without public knowledge over many decades to fight the Soviet Union. You can draw your own conclusions. Was it a huge confidence trick? Probably not, but the US Government was ripped off to the extent that 90% of the intel they received was undoubtably flawed, inaccurate and not worth the paper it was written on. But the fact 10% of the intel was accurate, was probably enough to deal to the Dark Empire.