>> the unabomber was back in action. and investigators were no closer to finding him than they'd been when they started 15 years earlier. >> the unabomber, he was obsessed with ensuring that he threw us off the trail forensically. so he would do a number of things. the return addresses on the unabomb devices were real names of real people at real addresses of, say, their home or place of business. others were a location that actually existed, but actually a phony address. there was no such business at that particular address. and still others were meant to mock the fbi. for example, on one of the letters the unabomber sent, the address was 9th and pennsylvania avenue northwest in washington, d.c. which, of course, is the address of the j. edgar hoover fbi building. in one of these letters, he said the fbi is a joke. the fbi will not be catching us anytime soon. >> the fbi, of course, had no idea about the unabomber's identity or whereabouts. and ted kaczynski took great pains to make sure he didn't leave a single clue. >

it becomes known as the unabomber manifesto. >> there were many people that thought the unabomber manifestoas a red herring. i had agents come to my office saying we're wasting too much time. we need to stick with forensics and known facts. >> most people in the fbi never even read the manifesto. the popular opinion was that it was nonsense, it was just scribbling. >> the media and the fbi are faced with a dilemma. publishing the manifesto could be seen as giving in to terrorist demands. >> the last thing we wanted to do is set a precedent that we would be blackmailed into publishing terrorist manifestos. because every terrorist could decide this is nice, we'll try this too. this too. >> attorney general janet reno called us to a meeting. essentially what we said to her was the reason you should publish this is somebody out there has seen these words before and they're going to recognize him by his words. >> "the washington post" publishes the manifesto on publishes the manifesto on september 19th, 1995. >> after the publication of the >> after the publication of the >> after the publicatio

the unabomber.ext. >>> a simple sketch was almost all investigators had to go on. the facial features were distinct, but the head was cloaked by a hood. and the eyes obscured by aviator sunglasses. for more than 17 years, he operated without restraint. in all that time, no one knew who he was or how exactly he chose his targets. even his victims remained in the dark until he struck. >> i had never heard of the unabomber before i was injured. i had learned about the existence of the unabomber two days after i came home from the hospital. >> february 20th, 1987. an unseasonably warm and sunny day in salt lake city. police and emergency personnel respond to a report of an explosion outside cam's computer services. owner gary wright had arrived at his office at 10:25 a.m. >> when i had pulled into the parking lot, i noticed there was a piece of wood over to the right-hand side near my secretary's car. two two by fours that appeared to be nailed together. i thought well, it's just a piece of scrap lumber

it becomes known as the unabomber manifesto. >> there were many people that thought the unabomber manifestohad agents come to my office saying we're wasting too much time. we need to stick with forensics and known facts. >> most people in the fbi never even read the manifesto. the popular opinion was that it was nonsense, it was just scribbling. >> the media and the fbi are faced with a dilemma. publishing the manifesto could be seen as giving in to terrorist demands. >> the last thing we wanted to do was set a precedent that we would be blackmailed into publishing terrorist manifestos. because every terrorist could decide this is nice, we'll try this too. >> attorney general janet reno called us to a meeting. essentially what we said to her is the reason you should publish this is somebody out there has seen these words before and they're going to recognize him by his words. >> "the washington post" publishes the manifesto on september 19th, 1995. >> after the publication of the unabomber manifesto, we received almost 55,000 calls. we had wives turning in their husbands. we had girlfriends

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. >> the unabomber left his angry mark of death. >> he orchestrated a vicious bombing spree that killed in all 16 bombs, locations all over the united states. >> i began to think i may not make it. >> his base of operations was crude.

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candice delong is a retired fbi profiler and some of her biggest cases included the unabomber and the case. welcome to cnbc. you know, mr. cohen just suggested that if they had looked at mr. alexis' background, his profile more closely, potentially this incident could have been averted. do you see it that way? >> well, quite possibly. he had two different disciplinary actions when he was enlisted in the navy and they both concerned weaponry. this man should not have been given a security clearance. ever. i don't know how this happened. >> yeah. well that's what i think we're all asking today. given his background, given the fact that he had two incidents in his history involving the discharging of fire arms, apparently after sort of angry interchanges with a neighbor or someone who was parking in a space or something like that, you would have to question why he got the security clearance. are there signs that people could look for to tell whether someone is close to the edge or about to go off in this kind of violent way? >> yes. usually before people that commit this kind of crimes,