D.C. Mun. Regs. tit. 14, § 307
307.1 No action or proceeding to recover possession of a habitation may be brought against a tenant, nor shall an owner otherwise cause a tenant to quit a habitation involuntarily, in retaliation for any of the tenant's actions listed in § 307.3.
307.2 No demand for an increase in rent from the tenant, nor decrease in the services to which the tenant has been entitled, nor increase in the obligations of a tenant shall be made in retaliation against a tenant for any of the tenant's actions listed in § 307.3.
307.3 This section prohibits the taking of any of the actions set forth in this section in retaliation against the tenant for any of the following actions by a tenant:
(a) A good faith complaint or report concerning housing deficiencies made to the owner or a governmental authority, directly by the tenant or through a tenant organization;
(b) The good faith organization of a tenant organization or membership in a tenant organization;
(c) The good fait assertion of rights under this subtitle, including rights under §§ 301 and 302 of this chapter, or § 101 of chapter 1.
SOURCE: The Housing Regulations of the District of Columbia, 5G DCRR § 2910, Commissioners' Order 55-1503 (August 11, 1955).