 He became gradually less attracted to communism and became a less active member, finally leaving the Party in 1956 like many other intellectuals, after the Soviet Union brutally suppressed the Hungarian Revolution (Haldane had left the party in 1950 after becoming similarly disillusioned).In 1962 he was one of the founding members of the University of Sussex and was a Dean between 1965–85.He subsequently became a professor emeritus.