Jeju uprising. 1955 – The American Civil Liberties Union announces it will defend Allen Ginsberg's book Howl against obscenity charges. 1956 – Hudsonville–Standale tornado: The western half of the Lower Peninsula of Michigan is struck by a deadly F5 tornado. 1968 – Martin Luther King Jr. delivers his "I've Been to the Mountaintop" speech; he was assassinated the next day. 1969 – Vietnam War: United States Secretary of Defense Melvin Laird announces that the United States will start to "Vietnamize" the war effort. 1973 – Martin Cooper of Motorola makes the first handheld mobile phone call to Joel S. Engel of Bell Labs. 1974 – The 1974 Super Outbreak occurs, the second largest tornado outbreak in recorded history (after the 2011 Super Outbreak). The death toll is 315, with nearly 5,500 injured. 1975 – Vietnam War: Operation Babylift, a mass evacuation of children in the closing stages of the war begins. 1975 – Bobby Fischer refuses to play in a chess match against Anatoly Karpov, giving Karpov the title of World Champion by default. 1980 – US Congress restores a federal trust relationship with the 501 members of the Shivwits, Kanosh, Koosharem, and the Indian Peaks and Cedar City bands of the Paiute people of Utah. 1981 – The Osborne 1, the first successful portable computer, is unveiled at the West Coast Computer Faire in San Francisco. 1989 – The US Supreme Court upholds the jurisdictional rights of tribal courts under the Indian Child Welfare Act of 1978 in Mississippi Choctaw Band v. Holyfield. 1993 – The outcome of the Grand National horse race is declared void for the first (and only) time 1996 – Suspected "Unabomber" Theodore Kaczynski is captured at his Montana cabin in the United States. 1996 – A United States Air Force Boeing T-43 crashes near Dubrovnik Airport in Croatia, killing 35, including Secretary of Commerce Ron Brown. 1997 – The Thalit massacre begins in Algeria; all but one of the 53 inhabitants of Thalit are killed by guerrillas. 2000 – United States v. Microsoft Corp.: Microsoft is ruled to have violated United States antitrust law by keeping "an oppressive thumb" on its competitors. 2004 – Islamic terrorists involved in the 2004 Madrid train bombings are trapped by the police in their apartment and kill themselves. 2007 – Conventional-Train World Speed Record: A French TGV train on the LGV Est high speed line sets an official