It was during the 1960s, and then largely in the city of Kabul—on its treeshaded university campuses and in its army barracks—that radical doctrines carried in from outside the country set the stage for cataclysm. As the KGB-sponsored Marxists formed their cabals and recruited followers, equally militant Afghan Islamists rose up to oppose them. Every university student now confronted a choice: communism or radical Islam.

