a second term as United Nations Secretary General. December 3 – Anti-Portuguese demonstrations occur in Macau; a curfew is declared the next day. December 5 – The U.S. Supreme Court rules in Bond v. Floyd that the Georgia House of Representatives must seat Julian Bond, having violated his First and Fourteenth Amendment rights. December 6 – Vietnam War: Bình Hòa massacre. December 7 Syria offers weapons to rebels in Jordan. Barbados is admitted to the United Nations. December 8 – The Typaldos Line's ferry sinks in rough seas in the Aegean Sea near Crete, leaving 217 dead. December 12 – Harry Roberts, John Whitney and John Duddy are sentenced to life imprisonment (each with a recommended minimum of 30 years) for the Shepherd's Bush murders of three London policemen on August 12. Roberts, arrested on November 15 north of London, will eventually spend nearly 48 years in prison. December 16 The United Nations Security Council approves an oil embargo against Rhodesia. The International Covenant on Economic, Social and Cultural Rights and the International Covenant on Civil and Political Rights are adopted by the General Assembly, as Resolution 2200 A (XXI). December 17 – South Africa does not join the trade embargo against Rhodesia. December 19 – The Asian Development Bank begins operations. December 20 – U.K. Prime Minister Harold Wilson withdraws all his previous offers to the Rhodesian government and announces that he will agree to independence for the country only after the establishment of a Black majority government there. December 22 – Prime Minister Ian Smith declares that Rhodesia is already a republic. December 24 – New York television station WPIX broadcasts The Yule Log for the first time; it becomes a Christmas tradition. December 25 – Marionette sci-fi series Thunderbirds airs its final episode on ITV in the United Kingdom with a Christmas special. December 26 – The first Kwanzaa is celebrated by Maulana Karenga, founder of Organization US (a black nationalist group) and chair of Black Studies at California State University, Long Beach, from 1989 to 2002. December 31 East German Premier Walter Ulbricht discusses negotiations about German reunification. Eight paintings worth millions of pounds are stolen from Dulwich Picture Gallery in London, but are recovered locally within a week. The Congolese government takes over the Union Minière du Haut Katanga. Date unknown Konstantin Chernenko, later leader of the Soviet Union, becomes a candidate member of the