This book examines the roots of terrorist movements, from the Muslim Brotherhood to ISIS, revealing their role in fuelling violence and threatening both intellectual and social security. It offers a focused and in-depth critical reading of the concepts that these organisations have reinterpreted outside their legitimate and historical contexts, relying on a selective use of religious texts in order to serve their ideological aims and partisan interests. 

In its first section, the book presents an overview of the history of terrorist movements and their role in generating extremism, instrumentalising violence, and threatening intellectual security. In its second section, it examines the legal-religious concepts appropriated by the terrorist Muslim Brotherhood organisation. It does so first by setting out the correct grounding of these concepts, then by identifying the distortions in the way they have been employed, highlighting how legal-religious concepts have been appropriated and turned into narrow partisan tools, resulting in behavioural deviation rooted in intellectual deviation. 

In this way, the book offers the reader a clear picture that helps distinguish between, on the one hand, the correct understanding of legal-religious concepts and religious texts and, on the other, deviant interpretations that run counter to the higher objectives of Islamic law, interpretations that have contributed to the production of extremism and threatened both individual security and social stability.