On June 22, 1960 Whitney Shepardson (who was in charge of Secrete Intelligence, SI during WWII) wrote the following in a letter to a source that will, for now, remain un-named:
"When I got back to New York last week after seeing many of our wartime colleagues in England and in France, I found your letter of May 4--which is a long, long time ago.
With respect to your letter from "Ti", I think that when you told A.W. D. (Dulles) about this you did not only the right thing, of course, but the only thing. Schluss!
We have recently had rough going under the tilt of the U-2