; and (3) by adding at the end the following: (c) In an action for damages resulting from a violation of section 8(b)(8) of the National Labor Relations Act ( 29 U.S.C. 158(b)(8) ), it shall not be a defense that the injured party has, in any manner, waived, or purported to waive, the right of such party to pursue monetary damages relating to the labor slowdown at issue— (1) in connection with a contractual grievance alleging a violation of a clause prohibiting a strike, or a similar clause, in a collective-bargaining agreement; or (2) in connection with an action for a breach of such a clause under section 301. .