This important dictionary defines those ideologies, political systems, strategies, methods, and concepts that form the core of nonviolent action as it has occurred throughout history and across the globe. Entries discuss everything from militarization to censorship, guerrilla theater, pacifism, and protest songs. Its author, Gene Sharp, is the founder of the Albert Einstein Institution, a Nobel Prize-nominated professor of political science (emeritus), and, in my favorite profile of him, a “dictator’s worst nightmare.”