This book offers a comparative look at the legal concept of militant democracy. It combines an analysis of the theoretical considerations of this concept with an investigation of its practice in a number of countries and on a diverse array of issues. The book provides a thematic treatment of militant democracy practices in a range of jurisdictions, including Australia, Turkey, Spain, Germany, Israel, India, the USA and the Council of Europe. Recent developments in the understanding of militant democracy are considered such as its possible extension to address threats other than undemocratic political parties such as dangerous religious movements and the threat of terrorism.