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One of the most spectacular terrorist episodes in U.S. history was the bombing of the World Trade Center in New York City in 1993 by Islamic radicals. This incident aroused anxiety about the threat posed by foreign residents from nations hostile to the United States. Six people died in the blast， which caused an estimated $600 million in property and other economic damage. Trials that followed convicted six people of carrying out the attack. In addition to foreign-sponsored terrorism， the United States has an ample history of domestic terrorism. Early in the 20th century， labor leaders such as William Dudley openly espoused a philosophy of revolutionary violence. In the late 1960s and early 1970s， during the latter stages of the U.S. involvement in the Vietnam War， some terrorist groups bombed buildings on university campuses throughout the country and at corporation headquarters and government buildings in New York City. Between 1978 and 1995， an anarchist and terrorist known as the Unabomber planted or mailed homemade bombs that killed 3 people and wounded 23 others in 16 separate incidents throughout the United States. The Unabomber， who claimed an allegiance with radical environmentalists and others opposed to the effects of industrialization and technology， targeted university professors， corporate executives， and computer merchants. In April 1996 federal agents arrested Theodore Kaczynski， a suspect they thought to be the Unabomber. Kaczynski， a Harvard-educated former math professor who became a recluse， pled guilty to 13 federal charges in 1998 in exchange for agreement that prosecutors would not seek the death penalty during sentencing. The court sentenced Kaczynski to four life terms plus 30 years and ordered him to pay $15 million in restitution. | 
