29 U.S. Code § 2615 - Prohibited acts
(a) Interference with rights
(1) Exercise of rights
It shall be unlawful for any employer to interfere with, restrain, or deny the exercise of or the attempt to exercise, any right provided under this subchapter.
(b) Interference with proceedings or inquiries
It shall be unlawful for any person to discharge or in any other manner discriminate against any individual because such individual—
(1) has filed any charge, or has instituted or caused to be instituted any proceeding, under or related to this subchapter;
(2) has given, or is about to give, any information in connection with any inquiry or proceeding relating to any right provided under this subchapter; or