Upon reading it, Kaczynski's brother, David, recognized the prose style and reported his suspicions to the FBI. 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 in 1996, 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 murdered three individuals and injured 23 others in a nationwide mail bombing campaign against people he believed to be advancing modern technology and the destruction of the natural environment.

He was a mathematics prodigy, but abandoned his academic career in 1969 to pursue a primitive lifestyle. Theodore John Kaczynski ( / k ə ˈ z ɪ n s k i/ kə- ZIN-skee – June 10, 2023), also known as the Unabomber ( / ˈ j uː n ə b ɒ m ər/ YOO-nə-bom-ər), was an American mathematician and domestic terrorist.

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