Relief Appropriation Act of 1935 becomes law. 1940 – The Central Committee of the Mongolian People's Revolutionary Party elects Yumjaagiin Tsedenbal as General Secretary, marking the beginning of his 44-year-long tenure as de facto leader of Mongolia. 1942 – World War II: The Japanese take Bataan in the Philippines. 1943 – U.S. President Franklin D. Roosevelt, in an attempt to check inflation, freezes wages and prices, prohibits workers from changing jobs unless the war effort would be aided thereby, and bars rate increases by common carriers and public utilities. 1943 – Otto and Elise Hampel are executed in Berlin for their anti-Nazi activities. 1945 – World War II: After an air raid accidentally destroys a train carrying about 4,000 Nazi concentration camp internees in Prussian Hanover, the survivors are massacred by Nazis. 1946 – Électricité de France, the world's largest utility company, is formed as a result of the nationalisation of a number of electricity producers, transporters and distributors. 1950 – India and Pakistan sign the Liaquat–Nehru Pact. 1952 – U.S. President Harry Truman calls for the seizure of all domestic steel mills in an attempt to prevent the 1952 steel strike. 1953 – Mau Mau leader Jomo Kenyatta is convicted by British Kenya's rulers. 1954 – A Royal Canadian Air Force Canadair Harvard collides with a Trans-Canada Airlines Canadair North Star over Moose Jaw, Saskatchewan, killing 37 people. 1954 – South African Airways Flight 201 A de Havilland DH.106 Comet 1 crashes into the sea during night killing 21 people. 1959 – A team of computer manufacturers, users, and university people led by Grace Hopper meets to discuss the creation of a new programming language that would be called COBOL. 1959 – The Organization of American States drafts an agreement to create the Inter-American Development Bank. 1960 – The Netherlands and West Germany sign an agreement to negotiate the return of German land annexed by the Dutch in return for 280 million German marks as Wiedergutmachung. 1968 – BOAC Flight 712 catches fire shortly after takeoff. As a result of her actions in the accident, Barbara Jane Harrison is awarded a posthumous George Cross, the only GC awarded to a woman in peacetime. 1970 – Bahr El-Baqar primary school bombing: Israeli bombers accidentally strike an Egyptian school. Forty-six children are killed. 1975 – Frank Robinson manages the Cleveland Indians in his first game as major league baseball's first African