Zorach Et Al. v. Clauson Et Al‪.‬

New York City has a program which permits its public schools to release students during the school day so that they may leave the school buildings and school grounds and go to religious centers for religious instruction or devotional exercises. A student is released on written request of his parents. Those not released stay in the classrooms. The churches make weekly reports to the schools, sending a list of children who have been released from public school but who have not reported for religious instruction.