People protest to try to change the world, because they think they can help change the world, and sometimes they do. But not by themselves, and generally not just how and when they want. This incisive book explains how groups of ordinary individuals can affect the world, what makes it possible when it works, and why it sometimes doesn't go to plan. Digging into previous scholarship on social movements, David S. Meyer looks at the origins of social movements, how they contrast with...