Even after WW2 you had German engineers and scientists brought to the U.S. as part of Operation Paperclip (more than 1600), many of them former National-Socialists such as Wernher von Braun whose pioneering contribution to the development of rocket engines was integral to the U.S winning the space race.
The Russians could gain access to even more German scientists (ca. 2200) as part of Operation Osoaviakhim.
Truly interesting recent history.
I listened to him in his german accented english on documentary selling his rocket technology to the American masses.