; (B) to coerce such worker 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, or provision of services by, such worker; or (C) to retaliate or threaten to retaliate against a worker for refusing to undertake or promise not to pursue, bring, join, litigate, or support any kind of joint, class, or collective claim arising from or relating to the employment of, or provision or services by, such worker: Provided , That any agreement that violates this paragraph or results from a violation of this paragraph shall be to such extent unenforceable and void: Provided further , That this paragraph shall not apply to any agreement embodied in or expressly permitted by a contract between an employer and a labor organization. . (2) Conforming amendment Section 10(b) of the National Labor Relations Act ( 29 U.S.C. 160(b) ) is amended by striking discharge and inserting discharge, or unless the person aggrieved thereby is a worker alleging a violation of section 8(a)(6) whose charge involves a postdispute arbitration agreement that meets the requirements under section 402(a)(2) of title 9, United States Code, in which event the six-month period shall be computed from the day the waiting period described in subparagraph (C) of such section ends . (b) Arbitration of work disputes (1) In general Title 9 of the United States Code is amended by adding at the end the following: 4 Arbitration of Work Disputes Sec. 401. Definitions. 402. Validity and enforceability. 401. Definitions In this chapter— (1) the terms commerce , employee , and employer have the meanings given the terms in section 3 of the Fair Labor Standards Act of 1938 ( 29 U.S.C. 203 ); (2) the term covered entity means— (A) an employer; or (B) an individual or entity that is not acting as an employer and engages the services of a worker