And rockets. And engineering, etc.
They were war booty. Which is an odd way to think about it and ultimately didn’t play out well.
The book Operation Paperclip is an excellent overview.
I'd be more interested in a book that factually reports, what actual intelligence, if any, the Nazis that worked for our government provided to combat communism. I highly doubt there was much to make it worth our while of giving known war criminals a pass to gather intelligence against our enemies. That's why we've never been told anything about the results it produced.