Wal-Mart v. Dukes, 564 U.S. 338 (2011), was a United States Supreme Court case in which the Court ruled that a group of roughly 1.5 million women could not be certified as a valid class of plaintiffs in a class-action lawsuit for employment discrimination against Walmart. Lead plaintiff Betty Dukes, a Walmart employee, and others alleged gender discrimination in pay and promotion policies and practices in Walmart stores.