The two were Polish Americans who were raised as Catholics but later became atheists. Theodore John Kaczynski was born in Chicago on May 22, 1942, to working-class parents Wanda Theresa ( née Dombek) and Theodore Richard Kaczynski, a sausage maker. Kaczynski's birth certificate and several of his driver's licenses He pleaded guilty to all charges in 1998 and was sentenced to eight consecutive life terms in prison without the possibility of parole.

Kaczynski was arrested in 1996, and-maintaining that he was sane-tried and failed to dismiss his court-appointed lawyers because they wanted him to plead insanity to avoid the death penalty. Upon reading it, Kaczynski's brother, David, recognized the prose style and reported his suspicions to the FBI. The FBI and Attorney General Janet Reno pushed for the publication of the essay, which appeared in The Washington Post in September 1995. In 1995, Kaczynski sent a letter to The New York Times promising to 'desist from terrorism' if the Times or The Washington Post published his manifesto, in which he argued that his bombings were extreme but necessary in attracting attention to the erosion of human freedom and dignity by modern technologies that require mass organization. The FBI used the case identifier UNABOM (University and Airline Bomber) before his identity was known, resulting in the media naming him the 'Unabomber'. In 1979, Kaczynski became the subject of what was, by the time of his arrest, the longest and most expensive investigation in the history of the Federal Bureau of Investigation (FBI). After witnessing the destruction of the wilderness surrounding his cabin, he concluded that living in nature was becoming impossible and resolved to fight industrialization and its destruction of nature through terrorism. In 1971, Kaczynski moved to a remote cabin without electricity or running water near Lincoln, Montana, where he lived as a recluse while learning survival skills to become self-sufficient. He authored Industrial Society and Its Future, a 35,000-word manifesto and social critique opposing industrialization, rejecting leftism, and advocating for a nature-centered form of anarchism.

Between 19, Kaczynski killed three people and injured 23 others in a nationwide mail bombing campaign against people he believed to be advancing modern technology and the destruction of the environment. He was a mathematics prodigy, but abandoned his academic career in 1969 to pursue a more primitive life.

Theodore John Kaczynski ( / k ə ˈ z ɪ n s k i/ kə- ZIN-skee born May 22, 1942), also known as the Unabomber ( / ˈ j uː n ə b ɒ m ər/), is an American domestic terrorist and former mathematics professor.

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