march, organized by the National Mobilization Committee to End the War in Vietnam, from Central Park to the United Nations drew hundreds of thousands of people, including Dr. Martin Luther King Jr., Harry Belafonte, James Bevel, and Dr. Benjamin Spock, who marched and spoke at the event. A simultaneous march in San Francisco was attended by Coretta Scott King. Scotland defeats England 3–2 at Wembley Stadium, with goals from Law, Lennox and McCalligog, in the British Championships. This is England's first defeat since they won the World Cup, and ends a 19-game unbeaten run. April 20 The Surveyor 3 probe lands on the Moon. A Globe Air Bristol Britannia turboprop crashes at Nicosia, Cyprus, killing 126 people. April 21 Greece suffers a military coup by a group of military officers, who establish a military dictatorship led by Georgios Papadopoulos; future-Prime Minister Andreas Papandreou remains a political prisoner till December 25. The dictatorship ends in 1974. An outbreak of tornadoes strikes the upper Midwest section of the United States (in particular the Chicago area, including the suburbs of Belvidere and Oak Lawn, Illinois where 33 people are killed and 500 injured). April 23 – A group of young leftist radicals are expelled from the Nicaraguan Socialist Party (PSN). This group goes on to found the Socialist Workers Party (POS). April 24 Soyuz 1: Vladimir Komarov becomes the first Soviet cosmonaut to die, when the parachute of his space capsule fails during re-entry. In the NBA, the Philadelphia 76ers defeat the San Francisco Warriors 125–122 in game six to win the title. Some say this team is arguably the greatest of all time. A total lunar eclipse took place. April 27 – Montreal, Quebec, Expo 67, a World's Fair to coincide with the Canadian Confederation centennial, officially opens with Prime Minister Lester B. Pearson igniting the Expo Flame in the Place des Nations. April 28 In Houston, Texas, boxer Muhammad Ali refuses military service. He is stripped of his boxing title and barred from professional boxing for the next three years. Expo 67 opens to the public, with over 310,000 people attending. Al Carter from Chicago is the first visitor as noted by Expo officials. The U.S. aerospace manufacturer McDonnell Douglas is formed through a merger of McDonnell Aircraft and Douglas Aircraft (it becomes part of The Boeing Company three decades later). April 29 – Fidel Castro announces that all intellectual property