Book excerpt: Whilst the protection of political speech is essential to the preservation of a democratic legal order, events of political violence and assassinations highlight the need to rethink questions relating to the boundaries of free speech in a democratic society. To what extent should democratic countries committed to freedom of speech limit those forms of extreme speech that may be considered as incitements to violence? This is a question that has long divided academics and activists alike. It has become even more relevant today, with the recent rise of extreme right-wing parties in various European democracies. In this book, leading scholars of constitutional law, human rights and criminal law, from various countries with divergent philosophies on freedom of speech, address the question of whether we can, and should, regulate speech in order to protect democracy and, if so, how.