prison for five years, he was locked up with the assassins of anwar sadat and leaders of the muslim brotherhoody, if you weren't radicalized up until then, you certainly would've been then. >> nawaz: well, the interesting thing with these guys is that, in the 20 or so years since they've been imprisoned, they'd gone through a process where they had abandoned their jihadist views. >> stahl: they did? >> nawaz: yeah. and my initial reaction was, "oh, my god, you've sold out. and so, i approached them with an idea to try and actually convince them they were wrong. >> stahl: you were going to re- reconvert them? >> nawaz: yeah. and what ended up happening was, through the discussion process, i began doubting the strength of my own convictions. >> stahl: they were able to persuade him that today's radical ideology is closer to fascism than true islam, so after four years in prison, he returned to england in 2006 and soon left h.t. how difficult was that, to break away like that? >> nawaz: it was traumatic. >> stahl: traumatic. >> nawaz: because all my friend's circle... friendship circle, my family.