20 U.S. Code § 4071 - Denial of equal access prohibited
It shall be unlawful for any public secondary school which receives Federal financial assistance and which has a limited open forum to deny equal access or a fair opportunity to, or discriminate against, any students who wish to conduct a meeting within that limited open forum on the basis of the religious, political, philosophical, or other content of the speech at such meetings.
A public secondary school has a limited open forum whenever such school grants an offering to or opportunity for one or more noncurriculum related student groups to meet on school premises during noninstructional time.
Notwithstanding the availability of any other remedy under the Constitution or the laws of the United States, nothing in this subchapter shall be construed to authorize the United States to deny or withhold Federal financial assistance to any school.
Nothing in this subchapter shall be construed to limit the authority of the school, its agents or employees, to maintain order and discipline on school premises, to protect the well-being of students and faculty, and to assure that attendance of students at meetings is voluntary.