Who was the Unabomber? What was in his manifesto?

Luigi Mangione reopened the discussion around the Unabomber, one of the most famous and feared domestic terrorists in recent US history.

Ted Kaczynski, the Unabomber, died last year from self-inflicted wounds at 81 in prison. The criminal, who had terminal cancer, was responsible for the death of three people and the injuries of 23.

Similar to Luigi Mangione, Ted Kaczynski had a promising Ivy League education. He entered Harvard at 16 and underwent regular evaluations, which concluded that he was “exceedingly stable, well integrated.”

However, at Harvard, he was also a subject in a study reported to be part of the now-questioned MK Ultra program. The experiment pushed a group of volunteer students to the edge.

It was not the first time Mr. Kaczynski had suffered psychological abuse. When he was a child, he skipped a grade after his teachers labeled him a genius. He was verbally abused and teased by the older kids.

Mr. Kaczynski graduated from Harvard and began his postgraduate studies at Michigan University. After earning his Ph.D., he, then 25, accepted a short-lived position as an assistant professor at the University of California, Berkeley.

According to The Atlantic, he already knew he wanted to resign before starting: he was only saving for his plan to move to Montana's wilderness and live off the land.

He started sending envelopes with homemade explosives from there. He attacked an American Airlines flight and the President of United Airlines. He also targeted six universities, getting the name University and Airline Bomber, or Unabomber.

However, Kaczynski also targeted specific people or businesses, like computer stores. He sent explosives to an advertising executive who had worked with Exxon and a timber lobbyist.

Kaczynski carefully planned his bombings, targeting only those he considered to be advancing technology and destroying the environment. He put all his ideas in the 35,000-word manifesto.

The document was titled "Industrial Society and Its Future," signed by the 'Freedom Club,' despite him being the only author. The New York Times said Mr. Mangione left a review of the text in Goodreads.

The essay, published by Penthouse and the Washington Post, said industrialization destroyed humanity and technology destabilized society.

“It’s simply impossible to ignore how prescient many of his predictions about modern society turned out,” Mr. Mangione wrote in his review, the NY Times reported.

According to the newspapers, the suspect in the murder of UnitedHealthcare CEO Brian Thompson also wrote the Unabomber belonged in prison because he hurt innocent people.

When he wrote his manifesto in 1995, Kaczynski sent a letter to the New York Times and the Washington Post demanding its publication. In exchange, he offered to stop the bombings.

According to the AP, the search for the Unabomber was the most extended and costliest the FBI had conducted. His brother David recognized his writing in the manifesto and tipped off the agency in 1996.

David Kaczynski also spoke after the media found Luigi Mangione's reviews of his brother's manifesto. He told NBC that his brother's behavior was "like a virus," as collected by Forbes.

Ted Kaczynski's trial has become controversial over the years. According to The Atlantic, he thinks his family and lawyers fabricated a narrative of mental illness to help him avoid the death penalty.