Book excerpt: Extremism, Counter-terrorism and Policing brings together a diverse range of multidisciplinary studies to explore the extent of extremism and how communities are policed. Through analysing the historical development, the present situation, and future trends in the forms and ability to police violent extremism and terrorism, this text provides a detailed contribution towards both academic and policy debate surrounding extremism, its causes, and treatments. With chapters written by experts in their fields, this book provides the reader with detailed definitions of extremism; the psychology of extremists and the causes of radicalisation; policing extremism within a counter-terrorism context; community policing approaches to combating extremism; the legal frameworks and legislation regarding extremism and its limitations in an international setting; and public perceptions and understanding of extremism. It is crucial for policing professionals, policy-makers and academics to have a detailed understanding of government policy and the methods towards tackling extremism from a policing and community level. Extremism, Counter-terrorism and Policing gives a policing rationale alongside specific community approaches towards tackling extremist threats and provides key details for policy readers as well as academics.