Zero tolerance began as a prohibition against guns, but it has quickly expanded into a frenzy of punishment and tougher disciplinary measures in American schools. Ironically, as this timely collection makes clear, recent research indicates that as schools adopt more zero tolerance policies they in fact become less safe, in part because the first casualties of these measures are the central, critical relationships between teacher and student and between school and community.

"Zero Tolerance" assembles prominent educators and intellectuals, including the Rev. Jesse L. Jackson, Sr.,...