"Snitch! is a concise and fluent reminder that, for all the publicity about increasing technical surveillance, informers were not just the first way by which states sought security information but are now re-emphasised as a critical feature of countering terrorism. Through examining famous cases and general aspects of the recruitment and use of informers, Steve Hewitt has provided an excellent survey of their utility for ‘authorities' and the personal and social costs entailed." --Peter Gill, University of Liverpool