The then-dean of UC Berkeley's school of chemistry, Kenneth Pitzer, said to agents in 1952 that his opinion of Oppenheimer had changed over the years — earlier, in 1947, he had said that he had"the utmost confidence in both the loyalty and the scientific ability" of Oppenheimer, according to the report.
During the investigation, though, Pitzer said he had new doubts about Oppenheimer's loyalty to the country, due to his initial reservations about the development of the H-bomb. After Oppenheimer's concerns were overruled, he"impeded" other scientists' progress on the bomb, Pitzer said. Another professor at Loyola University, Chicago, Ward Evans, said he felt Oppenheimer did not hinder the production of the H-bomb, and said he was"less of a security risk than he was in 1947" when he was cleared by the Atomic Energy Commission, according to the investigation.
The other main accusation against Oppenheimer was his alleged connections to the communist party.