At 2:30 A.M., Tuesday, April 30, a thousand New York City policeman attacked an approximately equal number of students barricaded inside five Columbia University buildings. The action lasted three hours and injured at least 148 persons in varying degrees. Many students were thrown or dragged down stairways. Girls were pulled out by the hair; their arms were twisted; they were punched in the face. Faculty members were kicked in the groin, tossed through hedges, punched in the eye. Noses and cheekbones were broken. A diabetic student fell into a coma. One faculty member suffered a nervous collapse. Many students bled profusely from head wounds opened by handcuffs wielded as weapons.