After his death , Azzam ’s militant ideology and related paramilitary manuals were promoted through print and Internet media by Azzam Publications , a publishing house that operated from a London post office box and an Internet site . Both were shut down shortly after the September 11 attacks and are no longer active , though mirror sites persisted for some time afterwards . Babar Ahmad , the administrator of azzam.com , was extradicted from the UK to the USA where he pleaded guilty to " conspiracy and providing material support to terrorism . " Azzam popularized the idea of armed Islamic struggle ( which went on to be developed further by groups such as the Armed Islamic Group of Algeria ( GIA ) ) . Prior to his work , declarations of jihad in the twentieth century ( such as against Israel ) were essentially rhetorical and served more as a religious blessing of wars already declared and organized by secular bodies . But with his tireless travel and exhortation of activists , thousands of whom traveled to be trained and to fight in Afghanistan , what Azzam " called for actually came about "
September 11 attacks
September 11 attacks
Abdullah Yusuf Azzam