Terrorism is not a new phenomenon but has been present for over two thousand years. It has been used to advance ethnic, religious, and ideological goals; it has been used by dissidents and states to maintain control; it has been used at times as a means for attaining or maintaining power for its own sake. Terrorism has often appeared as a response to the intrusion of outside groups in established societies. This book places terrorism in a historical and analytical context. It is a comparison of terrorist groups over time, noting both similarities and differences. It will also contribute to discussions of the underlying causes of terrorism by providing a broader context than is usually attempted. It is important to put recent terrorist events in an appropriate context and to learn what history has to offer for dealing with this type of political violence.