; in the case of a group health plan (as so defined), whether the provisions of the plan permit the plan sponsor or any employer participating in the plan to unilaterally modify or terminate the benefits under the plan with respect to employees, retired employees, and beneficiaries, and when and to what extent benefits under the plan are fully vested with respect to employees, retired employees, and beneficiaries after the name and address of such issuer . (b) Presumption that retired employee health benefits cannot be modified or terminated Section 502 of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1132 ) is amended by adding at the end the following new subsection: (n) In the case of a suit brought under this title by a participant or beneficiary relating to benefits of a retired employee or the dependents of a retired employee under a group health plan (as defined in section 733(a)(1)), the presumption for purposes of such suit shall be that as of the date an employee retires or completes 20 years of service with the employer, benefits available under the plan during retirement of the employee are fully vested and cannot be modified or terminated for the life of the employee or, if longer, the life of the employee's spouse. This presumption can be overcome only upon a showing, by clear and convincing evidence, that the terms of the group health plan allow for a modification or termination of benefits available under the plan and that the employee, prior to becoming a participant in the plan, was made aware, in clear and unambiguous terms, that the plan allowed for such modification or termination of benefits. . 3. Protection of retirees under certain collectively bargained agreements Section 8 of the National Labor Relations Act ( 29 U.S.C. 158 ) is amended by adding at the end the following: (h) It shall be an unfair labor practice for any labor organization and any employer to enter into any contract or agreement, express or implied, whereby the organization and employer agree to modify