American Federation of Labor. 1941 – World War II: German troops enter Athens. 1945 – World War II: The last German formations withdraw from Finland to Norway. The Lapland War and thus, World War II in Finland, comes to an end and the Raising the Flag on the Three-Country Cairn photograph is taken. 1945 – World War II: Benito Mussolini is arrested by Italian partisans in Dongo, while attempting escape disguised as a German soldier. 1953 – Operation Moolah offers $50,000 to any pilot who defects with a fully mission-capable Mikoyan-Gurevich MiG-15 to South Korea. The first pilot was to receive $100,000. 1967 – Expo 67 officially opens in Montreal, Quebec, Canada with a large opening ceremony broadcast around the world. It opens to the public the next day. 1976 – Thirty-seven people are killed when American Airlines Flight 625 crashes at Cyril E. King Airport in Saint Thomas, U.S. Virgin Islands. 1978 – John Ehrlichman, a former aide to U.S. President Richard Nixon, is released from the Federal Correctional Institution, Safford, Arizona, after serving 18 months for Watergate-related crimes. 1978 – The Saur Revolution begins in Afghanistan, ending the following morning with the murder of Afghan President Mohammed Daoud Khan and the establishment of the Democratic Republic of Afghanistan. 1978 – Willow Island disaster: In the deadliest construction accident in United States history, 51 construction workers are killed when a cooling tower under construction collapses at the Pleasants Power Station in Willow Island, West Virginia. 1981 – Xerox PARC introduces the computer mouse. 1986 – The city of Pripyat and surrounding areas are evacuated due to Chernobyl disaster. 1987 – The U.S. Department of Justice bars Austrian President Kurt Waldheim (and his wife, Elisabeth, who had also been a Nazi) from entering the US, charging that he had aided in the deportations and executions of thousands of Jews and others as a German Army officer during World War II. 1989 – The April 27 demonstrations, student-led protests responding to the April 26 Editorial, during the Tiananmen Square protests of 1989. 1992 – The Federal Republic of Yugoslavia, comprising Serbia and Montenegro, is proclaimed. 1992 – Betty Boothroyd becomes the first woman to be elected Speaker of the British House of Commons in its 700-year history. 1992 – The Russian Federation and 12 other former Soviet republics become members of the International Monetary Fund and the World Bank. 1993 –