Marcel Cadieux, diplomat (b at Montréal 17 June 1915; d at Pompano Beach, Fla 19 Mar 1981). A tough, astute international lawyer and fierce anticommunist, Cadieux served in the Department of External Affairs (now FOREIGN AFFAIRS AND INTERNATIONAL TRADE) 1941-79. As undersecretary of state 1964-70, Cadieux was an efficient administrator and uncompromising federalist, pressing for a department and a foreign policy that would reflect Canada's bicultural origins. He subsequently was ambassador to Washington 1970-75, headed the Canadian Mission to the EEC 1975-77, and was chief negotiator for Canada-US fisheries and boundary disputes 1977-79. He wrote an elegant diplomatic primer, The Canadian Diplomat (1963).