Recently, a wall was built in eastern Germany. Made of steel and cement blocks, topped with razor barbed wire, and reinforced with video monitors and movement sensors, this wall was not put up to protect a prison or a military base, but rather to guard a three-day meeting of the finance ministers of the Group of Eight (G8). The wall manifested a level of security that is increasingly commonplace at meetings regarding the global economy. The authors of Shutting Down the Streets have directly...