Many thanks to SWLing Post contributor Mike, who writes:
Good afternoon, Thomas. Recalling that there have been a few postings on the SWLing Post over time on the FCC’s Radio Intelligence Division, I thought this might interest you and some readers. I just came across this (I don’t even remember what linked me to it) and have only briefly looked reviewed it, but the manuscript appears to be pretty interesting. https://www.qsl.net/w3df/sterling/ridhist.pdf
Additional history can be found here: https://www.qsl.net/w3df/sterling/dfh1.html.
An interesting local (to me) tidbit on page 19: “It [RID] patrolled the outside of the Oak Ridge, Tennessee installation, the scene of the Manhattan Project but without the personnel knowing what atomic developments were being made inside.“
73,
Mike in Knoxville,
KW1ND
Fascinating! Thank you for sharing this, Mike.

thank you so much! As an interested person in history i not only enjoyed the subject, i read it and distributed it among friends with the same interests.
Again, thanks very much!
Great article about a boy from Maine doing good. My father was involved in crypto-intelligence in WWiI in the Army Signal Corps….never told me a thing about what he really did.
J