This book is a collection of contributions by leading scholars on theoretical and contemporary problems of militant democracy. The term 'militant democracy' was first coined in 1937. In a militant democracy preventive measures are aimed, at least in practice, at restricting people who would openly contest and challenge democratic institutions and fundamental preconditions of democracy like secularism - even though such persons act within the existing limits of, and rely on the rights offered by, democracy. In the shadow of the current wars on terrorism, which can also involve rights restrictions, the overlapping though distinct problem of militant democracy seems to be lost, notwithstanding its importance for emerging and established democracies. This volume will be of particular significance outside the German-speaking world, since the bulk of the relevant literature on militant democracy is in the German language. The book is of interest to academics in the field of law, political studies and constitutionalism.