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For years, he baffled police who dubbed his case UNABOM, for University and Airline Bombings.
Source: https://www.perthnow.com.au/news/crime/the-unabomber-has-died-in-a-us-federal-prison-c-10941071
When I joined the FBI's UNABOM Task Force (UTF) in July 1995, about a year after it was formed, it had been an active case for 17 years.