20 U.S.C. § 122

No part of the appropriations made by Congress for the Howard University shall be used, directly or indirectly, for the support of the theological department of said university, nor for the support of any sectarian, denominational, or religious instruction therein; and no part thereof shall be paid to said university until it shall accord to the Secretary of Education, or to his designated agent or agents, authority to visit and inspect such university and to control and supervise the expenditure therein of all moneys paid under said appropriations.