The Center Moriches Union Free School District (the school) (defendant) permitted civic organizations and other private groups to use school facilities after hours for various activities. However, that after-hours policy did not extend to religious groups. For example, a civic group could screen a child-rearing film on school grounds, but a religious group could not. Lamb’s Chapel (plaintiff) sued the district, which argued that its policy prevented the schools from violating the First Amendment’s Establishment Clause. The United States Supreme Court reviewed the case.