Should representative governments restrict the democratic rights of their extremist opponents?Militant Democracy refers to the defensive policies democracies use to respond to antidemocratic movements. Can defensive efforts that curtail rights of participation be consistent with democratic values? In this collection of essays, scholars from across politics, philosophy and law address theunresolved practical and theoretical questions concerning democracy and extremism. The collection provides an update to a key contemporary debate in democratic theory and asks us to reconsider the potential promise and costs of militant democracy.