Have you ever hear of #OperationPaperclip? No? Ask yourself why ..
Here you can check some official documents within the FOIA ERR ('Freedom of information act electronic reading room').
A short description from Wikipedia:
Operation Paperclip was a secret program of the Joint Intelligence Objectives Agency (JIOA) largely carried out by special agents of Army CIC, in which more than 1,600 German scientists, engineers, and technicians, such as Wernher von Braun and his V-2 rocket team, were taken from Germany to the United States, for U.S. government employment, primarily between 1945 and 1959. Many were former members, and some were former leaders, of the Nazi Party.