This timely edited collection brings together experts in the fields of legal history, criminal justice, human rights and counter-terrorism law to appraise Ireland's Offences Against the State Act on the eightieth anniversary of its enactment. The origins, development, invocation and extension of the powers contained in the legislation are analysed and critiqued using a broad range of methodologies. The book engages fully with the 1939 Act's scope and complexity including consideration of the impact of the Act on issues as diverse as trial by jury, paramilitary organisations, organised crime, disclosure, the rules of evidence, freedom of expression and association, parliamentary oversight of legislation and adherence to international human rights norms. In addition, the interplay of the Act with the universal themes of normalcy, exceptionalism, contagion and due process are explored throughout. This book will appeal to an audience beyond those with a particular interest in the Act itself. It combines historical and contemporary insights with theoretical and practical perspectives that will enrich the reader's understanding of emergency law, wherever it arises.