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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