; (2) by inserting (other than subsection (a)(4) of such section) after section 15 ; (3) by striking subsection each place it appears and inserting paragraph ; and (4) by adding at the end the following: (2) Any person who repeatedly or willfully violates section 15(a)(4) shall upon conviction thereof be subject to a fine of not more than $50,000, or to imprisonment for not more than 1 year, or both. . 3. Effective dates (a) Application to all workers The amendments made by section 2(a) shall take effect on the date that is 90 days after the date of enactment of this Act. (b) Penalties The amendments made by subsections (b) and (c) of section 2 shall apply with respect to violations alleged to have occurred on or after the date of the enactment of this Act.