The 1968 Democratic Convention, best known for police brutality against demonstrators, has been relegated to a dark place in American historical memory. Battleg

How insurgencies—enabled by digital devices and a vast information sphere—have mobilized millions of ordinary people around the world. In the words of econo

On May 4, 1886, a bomb exploded during a labor demonstration near Haymarket Square. The ensuing gunfire and chaos brought a grisly end to what began as peaceful