45 CFR § 90.46
Prohibition against intimidation or retaliation
April 14, 2021
Each agency shall provide in its regulations that recipients may not engage in acts of intimidation or retaliation against any person who:
(a) Attempts to assert a right protected by the Act; or
(b) Cooperates in any mediation, investigation, hearing, or other part of the agency's investigation, conciliation, and enforcement process.