34 CFR 106.71: Retaliation.

A recipient must prohibit retaliation, including peer retaliation, in its education program or activity. When a recipient has information about conduct that reasonably may constitute retaliation under Title IX or this part, the recipient is obligated to comply with § 106.44. Upon receiving a complaint alleging retaliation, a recipient must initiate its grievance procedures under § 106.45, or, as appropriate, an informal resolution process under § 106.44(k). As set out in § 106.45(e), if the complaint is consolidated with a complaint of sex-based harassment involving a student complainant or student respondent at a postsecondary institution, the grievance procedures initiated by the consolidated complaint must comply with the requirements of both §§ 106.45 and 106.46.