It was after 10 p.m. on May 4, 1886, amid the greatest strike Chicago had ever seen. With clouds covering the moon, a mass meeting of workers was taking place in the Haymarket, an open-air farmers’ market stinking of horse manure and rotting vegetables. After the last orator had called for violence against the rich and powerful, a phalanx of police moved in to close things down.Then, someone threw a dynamite bomb. It exploded among the police, and the surviving cops opened fire on the crowd. Seven demonstrators died. Sixty cops were injured and seven of them later died of their wounds, although many believed even then that the injuries stemmed more from friendly fire than the TNT.