; (2) prohibit retaliation against workers for refusing to arbitrate work disputes; (3) provide protections to ensure that post­dis­pute arbitration agreements are truly voluntary and with the informed consent of workers; and (4) amend the National Labor Relations Act to prohibit agreements and practices that interfere with employees' right to engage in concerted activity regarding work disputes. 4. Protection of concerted activity (a) Agreements Section 8(a) of the National Labor Relations Act ( 29 U.S.C. 158(a) ) is amended— (1) in paragraph (5), by striking the period at the end and inserting ; and ; and (2) by adding at the end the following: (6) (A) to enter into or attempt to enforce any agreement, express or implied, whereby prior to a dispute to which the agreement applies, an employee undertakes or promises not to pursue, bring, join, litigate, or support any kind of joint, class, or collective claim arising from or relating to the employment of such employee in any forum that, but for such agreement, is of competent jurisdiction; (B) to coerce such an employee into undertaking or promising not to pursue, bring, join, litigate, or support any kind of joint, class, or collective claim arising from or relating to the employment of such employee