United States labor law
Since the Civil Rights Act of 1964, all employing entities and labor unions have a duty to treat employees equally, without discrimination based on "race, color, religion, sex, or national origin." There are separate rules for sex discrimination in pay under the Equal Pay Act of 1963. Additional groups with "protected status" were added by the Age Discrimination in Employment Act of 1967 and the Americans with Disabilities Act of 1990. There is no federal law banning all sexual orientation or identity discrimination, but 22 states had passed laws by 2016. These equality laws generally prevent discrimination in hiring, terms of employment, and make discharge because of a protected characteristic unlawful. There is no federal law against unjust discharge, and most states also have no law with full protection against wrongful termination of employment. Collective agreements made by labor unions and some individual contracts require people are only discharged for a "just cause". The Worker Adjustment and Retraining Notification Act of 1988 requires employing entities give 60 days notice if more than 50 or one third of the workforce may lose their jobs. Federal law has aimed to reach full employment through monetary policy and spending on infrastructure. Trade policy has attempted to put labor rights in international agreements, to ensure open markets in a global economy do not undermine fair and full employment.
Lilly Ledbetter Fair Pay Act of 2009
The antecedents of the case were posed when Lilly Ledbetter, a production supervisor at a Goodyear tire plant in Alabama, filed an equal-pay lawsuit regarding pay discrimination under Title VII of the Civil Rights Act of 1964 with the Equal Employment Opportunity Commission, six months before her early retirement in 1998. The courts gave opposite verdicts, first supporting the complaint and later opposing; in conclusion the complaint brought the case to the attention of the Supreme Court. The latter ruled in 2007 by a 5-4 majority vote that Ledbetter's complaint was time-barred because the discriminatory decisions relating to pay had been made more than 180 days prior to the date she filed her charge, as explained by Justice Samuel Alito. Justice Ruth Bader Ginsburg's dissenting opinion proposed an interpretation according to which the law runs from the date of any paycheck that contains an amount affected by a prior discriminatory pay decision.