29 C.F.R. § 38.18
(a) Employment practices covered. It is an unlawful employment practice to discriminate on the basis of race, color, religion, sex (including pregnancy, childbirth, and related medical conditions, transgender status, and gender identity), national origin, age, disability, or political affiliation or belief in the administration of, or in connection with:
(e) Employers, employment agencies, or other entities.