In Illinois, the Champaign Council on Religious Education, composed of Jewish, Catholic and Protestant groups, offers voluntary religious instruction to students in local public schools. The U.S. Supreme Court rules in McCollum v. Board of Education District that such use of school buildings is unconstitutional because it is “a utilization of the tax-established and tax-supported public school system to aid religious groups and to spread the faith,” and therefore violated the establishment of religion clause of the First Amendment.