Recent claims by astrophysicist Dr. Beatrice Villoriau suggest Menzel ordered the destruction of Harvard's astronomical photographic plates taken during the 1952 Washington DC UFO flap.
In 1951, 1952, and again in 1955, he worked as a consultant for the Psychological Strategy Board and its successor, the Operations Coordinating Board.
This is best shown in a series of declassified CIA documents from 1952.