Agostini v. Felton

New York City used federal Title I funds to send public school employees into religious schools to provide remedial education to disadvantaged students; an earlier Supreme Court decision, Aguilar v. Felton, had struck this practice down as excessive government entanglement with religion, leading to a permanent injunction. Years later, the school board and parents of religious-school students (petitioners) asked the district court for relief from that injunction, arguing intervening Establishment Clause cases had undermined Aguilar's reasoning; the district court and court of appeals denied relief, and the Supreme Court granted review.