 In the United States, the Establishment Clause of the First Amendment to the Constitution of the United States has had significant legal impact upon the activities of governments and of state-funded public schools during and relating to the Christmas and holiday season, and has been the source of controversy.Public schools are subject to what the Anti-Defamation League terms the "December dilemma", namely the task of "acknowledging the various religious and secular holiday traditions celebrated during that time of year" whilst restricting observances of the various religious festivals to what is constitutionally permissible.The ADL and many school district authorities have published guidelines for schools and for teachers.