Grounded in nine years of ethnographic research on the al Muhajiroun/Ahlus Sunnah Wal Jamaah movement (ALM/ASWJ), Douglas Weeks mixes ethnography and traditional research methods to tell the complete story of al Muhajiroun. Beginning with three core events that became a primer for radical Islamic political thought in the UK, Al Muhajiroun, A Case Study in Islamic Activism traces the development of the movement form its incipient beginnings to its current status. Based on his extensive interaction with the group and its leaders, Weeks contextualizes the history, beliefs, methods, and differences between ALM/ASWJ, al Qaeda, and the Islamic State so that the group and the threat it poses is comprehensively understood.