correspondent dan lothian says part of the lure is what volunteers are promised. it, too, he says, is social media, taking the islamists' messages everywhere. >> reporter: hanif qadir knows first-hand how easily radicals can claim young hearts and minds. 12 years ago he traveled from britain to afghanistan to help women and children caught up in war, but was reeled in by the taliban. >> i wanted to do something positive, but by getting involved with them i was slowly drawn into radical thinking, radical views, and then slowly being sucked into looking at other options of doing positive work, and that even meant violence. >> reporter: the depth of that violence is on display across the internet. extremist groups like isis spew disturbing rhetoric and proudly carry out beheadings. it's often done in the name of religion. >> people have tended to focus very much on, okay, this has to do with islam, but it is ultimately an islam that is interpreted by criminals. >> reporter: however the qur'an is interpreted, radicals are finding new recruits in the u.s. and around th

supreme court judge frankfurt also a close friend, spoke too of lothian's courage through the dark days. but on 28 november 1939, he began on this mischievously by asking, why all this trouble, about what he described as a medieval relic. then he gave his answer. the almost self-evident truths it pronounced have ek echoed through the pages of history, century after century by individual citizens and subjects, by rebels and conservatives, by parliaments and congresses, as the sufficient ground on which to base their claim for liberty and responsibility. he continued. in its immortal words, we see the nucleus of most of our liberties. the supremacy of law over arbitrary power. the inspiration which nerved the hands of those who struck the freedom and who built the institutions which secured it. and he went on not the findings of philosophers or the dreams, but a victory in the grim struggle of national life, for the principles of freedom from which we draw our being. down the years these words re-illuminate the call of the relationship between the peoples of great britain and the united s

. >>> also, correspondent dan lothian on why some young europeans and americans, men and women, try tothe most violent and radical islamist groups. >>> and fred de sam lazaro reports from the shrine of our lady of guadalupe in mexico, the most visited pilgrimage site in the catholic world. ♪