Why Was Ted Kaczynski Called the Unabomber? The FBI Code Name Explained

Unabomber grew out of UNABOM, the FBI’s code name for its University and Airline Bombing investigation. The label reflected the early targets, before investigators knew the bomber was Ted Kaczynski. Its origin was an investigative classification, rather than a name he chose for himself.

The FBI’s case history explains the abbreviation as UNiversity and Airline BOMbing. The case became associated with an unknown offender who was widely called the Unabomber; after his identification, that name remained attached to Kaczynski.

Why universities and airlines?

The earliest incidents gave investigators those categories. The first two attacks, in 1978 and 1979, were linked to universities. On November 15, 1979, American Airlines Flight 444 filled with smoke after an explosion in its luggage compartment. The aircraft landed safely, and passengers suffered smoke inhalation.

An attack in June 1980 injured United Airlines president Percy Woods. The acronym described that early pattern; it did not name a university, an airline or an organization that Kaczynski belonged to. The full case timeline shows how the targets changed over the following years.

Was every target a university or airline?

No. Later victims included people connected to computer businesses, advertising and forestry as well as universities. UNABOM remained the case name because an investigation’s label does not have to be rewritten with every new crime.

A 1998 Justice Department audit still used UNABOM for the entire series of 16 devices across 17 years. The abbreviation therefore describes the case’s starting classification, not a complete list of its victims or an explanation of each attack.

UNABOM and Unabomber are different kinds of names

UNABOM names the investigation. Unabomber refers to the offender. That distinction is easy to lose once a case label becomes part of headlines and film titles, but it explains why the term could exist before police knew Kaczynski’s identity.

In the FBI’s retrospective interview, investigators recount working on the case through letters, records and thousands of public tips. A familiar case name was not the same thing as knowing who was responsible. The later family tip and comparison of Ted’s earlier writing with the manifesto explain how investigators identified him.

Netflix uses UNABOMBER as the title of its 2026 drama. The word carries the history of the case, while the film’s characters and private scenes require separate scrutiny. Our true-story guide distinguishes that documented history from the adaptation.