He was extremely active in the anti-Vietnam war movement and, until the day before his death, he took an active part in efforts to bring about a nuclear freeze.
Siya ay lubhang aktibo sa anti-Vietnam war kilusan at, hanggang sa araw bago ng kanyang kamatayan, siya ay kinuha ng isang aktibong bahagi sa pagsisikap na magdala ng tungkol sa isang nuclear-freeze.