The book examines the dynamic of West European terrorism and counter-terrorism as it has evolved since the late 1960s. It assesses past, present and future terrorist trends and analyzes the internal security policies that have been initiated by the member states of the European Union (EU), both singularly and collectively, to combat terrorism in Western Europe. Throughout the book the theme of liberal democratic legitimacy and accountability is stressed, something that is brought particularly to bear on the latest EU internal security provision - the Maastricht Third Pillar.