the National Farmers Organization withheld milk supplies for 15 days as part of an effort to induce a quota system to stabilize prices. The May 1968 student and worker uprisings in France. Mass socialist or Communist movement in most European countries (particularly France and Italy), with which the student-based new left was involved. The most spectacular manifestation of this was the May student revolt of 1968 in Paris that linked up with a general strike of ten million workers called by the trade unions; and for a few days seemed capable of overthrowing the government of Charles de Gaulle. De Gaulle went off to visit French troops in Germany to check on their loyalty. Major concessions were won for trade union rights, higher minimum wages and better working conditions. University students protested in the hundreds of thousands against the Vietnam War in London, Paris, Berlin and Rome. In Eastern Europe students also drew inspiration from the protests in the West. In Poland and Yugoslavia they protested against restrictions on free speech by communist regimes. The Tlatelolco massacre – was a government massacre of student and civilian protesters and bystanders that took place during the afternoon and night of 2 October 1968, in the Plaza de las Tres Culturas in the Tlatelolco section of Mexico City. Coups Prominent coups d'état of the decade included: On 27 May 1960, a coup in Turkey led by Cemal Gürsel and Cemal Madanoğlu overthrew the government of Adnan Menderes. On 16 May 1961, a coup in South Korea led by army officer Park Chung-hee made the establishment of temporary military rule. In 1963, a coup in South Vietnam leads to the death of President Ngô Đình Diệm and the establishment of temporary military rule. On 31 March and 1 April 1964, a military coup in Brazil overthrows President João Goulart and starts a 21-year period of military dictatorship. On 21 April 1967, in Greece a group of colonels established a military dictatorship for seven years. In 1968, a coup in Iraq led to the overthrow of Abdul Rahman Arif by the Arab Socialist Baath Party. On 1 September 1969, a small group of military officers led by the army officer Muammar Gaddafi overthrows monarchy in Libya. Nuclear threats The Cuban Missile Crisis ( 16–28 October 1962) – a near-military confrontation between the U.S. and the Soviet Union about the presence of Soviet missiles in Cuba.