… who actually worked on the Manhattan Project in New Mexico during WW2:

MetaFilter: The FBI has a “Do Not Contact” List?

The Feynman Files. “For the first time, FBI records for Dr Richard Feynman have been released to the public. They document the Bureau’s apparent obsession in the 1950’s with outing him as a communist sympathizer, and include notations from several background checks as well as interviews with his colleagues, friends and acquaintances.”