29 C.F.R. § 1636.5
(f) Prohibition against retaliation—(1) Prohibition against retaliation. No person shall discriminate against any employee because such employee has opposed any act or practice made unlawful by the PWFA or because such employee made a charge, testified, assisted, or participated in any manner in an investigation, proceeding, or hearing under the PWFA.
(2) Prohibition against coercion. It shall be unlawful to coerce, intimidate, threaten, harass, or interfere with any individual in the exercise or enjoyment of, or on account of such individual having exercised or enjoyed, or on account of such individual having aided or encouraged any other individual in the exercise or enjoyment of, any right granted or protected by the PWFA.