The story behind Project Paperclip
After searching through various articles, I finally found out the story behind the name Project Paperclip. In short, President Truman gave the order to not let anyone deeply involved with the Nazi party to be brought over to the U.S. But since most of the scientists did have strong relationships with the party, Army intelligence and the CIA concealed the information and re-wrote their files to eliminate the incriminating evidence. The Americans then put an ordinary paperclip on the files to identify the German scientists. Thus the name "Project Paperclip" was created.