Legalities of retiree benefits modification.
D000368:Aged; D006264:Health Benefit Plans, Employee / Q000331:legislation & jurisprudence*; D006801:Humans; D007348:Insurance, Health / Q000331:legislation & jurisprudence*; D007750:Labor Unions / Q000331:legislation & jurisprudence; D010415:Pensions; D014481:United States