Amid the deluge of radical Islamic literature, few works are as influential to would-be terrorists as a booklet called “Constants on the Path of Jihad.” Written in Arabic by a Saudi al Qaeda adherent, the booklet is the subject of a series of wildly popular video lectures in English by Anwar al-Awlaki, the radical cleric who has become one of the world’s most-wanted men. Awlaki preaches worldwide violence in the name of Islam. Millions have viewed the videos on YouTube and jihadi sites, and a few viewers have gone on to commit terrorist acts as a result.
