This book explores how different publics make sense of and evaluate anti-terrorism powers within the UK, and the implications of this for citizenship and security.Since 9/11, the UK’s anti-terrorism framework has undergone dramatic changes, including with the introduction of numerous new pieces of legislation. Drawing on primary empirical research, this book examines the impact of these changes on security and citizenship, as perceived by citizens themselves. We examine such impacts on different communities within the UK, and find that generally, whilst white individuals were not unconcerned about the effects of anti-terrorism, ethnic minority citizens (and not Muslim communities alone) believe that anti-terrorism measures have had a direct, negative impact on various dimensions of their citizenship and security.This book thus offers the first systematic engagement with ‘vernacular’ or ‘everyday’ understandings of anti-terrorism policy, citizenship and security. Beyond an empirical analysis of citizen attitudes, it argues that while transformations in anti-terrorism frameworks impact on public experiences of security and citizenship, they do not do so in a uniform, homogeneous, or predictable manner. At the same time, public understandings and expectations of security and citizenship themselves shape how developments in anti-terrorism frameworks are discussed and evaluated. The relationships between these phenomenon, in other words, are both multiple and co-constitutive. By detailing these findings, this book adds depth and complexity to existing studies of the impact of anti-terrorism powers.The book will be of interest to a wide range of academic disciplines including Political Science, International Relations, Security Studies and Sociology.