We see nonviolent resistance all over today’s world, from Egypt’s Tahrir Square to New York Occupy. Although we think of the last century as one marked by wars and violent conflict, in fact it was just as much a century of nonviolence as the achievements of Mohandas Gandhi and Martin Luther King, Jr. and peaceful protests like the one that removed Ferdinand Marcos from the Philippines clearly demonstrate. But what is nonviolence? What makes a campaign a nonviolent one, and how does it work? What...