; Walsh-Healey Public Contracts Act; Davis-Bacon Act Section 6 of the Portal-to-Portal Act of 1947 ( 29 U.S.C. 255 ) is amended— (1) in the matter preceding subsection (a), by striking for unpaid minimum wages, unpaid overtime compensation, or liquidated damages, ; and (2) in subsection (a)— (A) by striking two years each place it appears and inserting 4 years ; (B) by inserting or repeated after willful ; and (C) by striking three years and inserting 6 years . (b) National Labor Relations Act Section 10(b) of the National Labor Relations Act ( 29 U.S.C. 160(b) ) is amended— (1) by striking six months prior to the filing of the charge with the Board and inserting 4 years prior to the filing of the charge with the Board, or 6 years prior to such filing in the case of an alleged willful or repeated unfair labor practice, ; and (2) by striking six-month period and inserting 4-year period, or 6-year period, as applicable, . (c) Occupational Safety and Health Act of 1970 Section 9(c) of the Occupational Safety and Health Act of 1970 ( 29 U.S.C. 658(c) ) is amended by striking expiration of six months following the occurrence of any violation and inserting “expiration of— (1) except as provided in paragraph (2), 4 years following the occurrence of any violation described in subsection (a); or (2) in the case of a violation described in subsection (a) that is willful or repeated, 6 years following the occurrence of the violation. . (d) Family and Medical Leave Act of 1993 Section 107(c) of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2617(c) ) is amended— (1) in paragraph (1), by striking 2 years and inserting 4 years