Since September 11, 2001 much has been written about 'Islamist terrorism, ' arguing that it is a perversion that has 'hijacked Islam' in the service of social, political and economic grievances. However, such accounts cannot explain why other people that can lay claim to similar or more serious grievances have not developed such devastating religious terrorist ideologies. Moreover, many of the terrorists themselves have attested to their own religious motivation and their belief that they acted in accordance with the precepts of Islam. In Warrant for Terror Shmuel Bar examines fatwas--legal...