He was a member of the Fabian Society, supported the Irish nationalist cause, fought racism, opposed the Korean War and the Vietnam War, was a founder member of CND in 1957, and was one of five Labour MPs on the first Aldermaston March in 1958. He wrote for "Tribune", and edited the anti-fascist magazine "Searchlight" from 1964 to 1967. He was co-chair of the socialist Zionist Poale Zion (Great Britain), but was critical of Israeli policy (e.g. he opposed the 1982 invasion of Lebanon). He attacked the British Nationality Act 1981, and criticised Conservative policy on Northern Ireland.