This video from the USA says about itself:
Conspiracy: CIA and the Nazis reveals how over 4,000 former Nazis went to work for the U.S. government, without the public’s knowledge, to help fight the Soviet Union. Reinhard Gehlen, an intelligence officer for Hitler’s General Staff, was tapped to head the U.S. intelligence program in West Germany to spy on the Russians.
At the same time, former Nazi scientists and engineers were welcomed onto American soil. But the extent of these operations is only now becoming clear: In 1998, a law was passed mandating declassification of documents concerning recruitment of former Nazis. CIA AND THE NAZIS examines these files to see how far the U.S. went in recruiting its former enemy to fight its new one.
From Ynetnews in Israel:
Secret report: CIA helped Nazis immigrate to US
Published: 11.14.10, 07:07
The CIA granted some Nazis entry to the US for intelligence gathering purposes after World War II, the New York Times reported, citing a 600-page report which the Justice Department “has tried to keep secret for four years.”
The list of Nazis who were aided by American intelligence officials includes [Baron] Otto Von Bolschwing, an associate of Adolph Eichmann who had helped develop the initial plans “to purge Germany of the Jews,” and Arthur L. Rudolph, a Nazi scientist who is credited as the father of the Saturn V rocket. (Yitzhak Benhorin, Washington)
See also here.
Secret Justice Department Report Details How the U.S. Helped Former Nazis: here.