This volume offers an up-to-date overview of the much-debated issue of how a democracy may defend itself against those who want to subvert it. The justifications, effectiveness and legal implications of militant democracy are discussed by addressing questions as: How can militant democracy measures such as party bans be justified? Why is it that some democracies ban antidemocratic parties? Does militant democracy succeed in combatting right-wing extremism? And is militant democracy evolving into an internationalized legal and political concept?