The use of public school facilities by religious organizations to give religious instruction to school children violates the Establishment Clause. Decided March 8, 1948 (argued December 8, 1947). Opinion of the Court: Hugo Black → go there Dissenting: Reed. Applied: the First Amendment → go there Applied: the Fourteenth Amendment → go there Topic: Freedom of religion. McCollum v. Board of Education, 333 U.S. 203 (1948), is a landmark United States Supreme Court case related to the power of a state to use its tax-supported public school system to aid religious instruction. The case was a test of the separation of church and state with respect to education. Wiki link