Pash was also called upon to investigate suspected Soviet espionage at the Radiation Laboratory at the University of California. He interrogated staff, including Robert Oppenheimer, whom he concluded "may still be connected with the Communist Party". Pash did not believe that Oppenheimer was a spy. He felt that Oppenheimer's personal honor and concern for his reputation would deter him from such action. Pash therefore did not recommend Oppenheimer's removal from the Manhattan Project, merely that Oppenheimer be accompanied by counter-intelligence agents.