How many Una-bombers were there?

Answer by  lcantoni (34)

Ted Kaczynski acted alone when he sent sixteen mail bombs to various people over a period of 20 years. He killed three people and injured twenty-three. He was a hermit and survivalist who believed, as he stated in his manifesto, that technology was destroying the human race. His own brother turned him in.

Answer by  Thejones (227)

He was the only one. While there have been other people to use bombs to kill people, he was the only one to do it the way he did, with as much success. Though there are other successful homicidal maniacs who killed mass amounts of people with one act of bombing.