On June 20, 2011, the U.S. Supreme Court overturned a lower-court decision that certified a massive class action against retailer Wal-Mart. The Court held that the case could not proceed as a class action because the plaintiffs failed to demonstrate that the members of the class shared a common legal claim. The suit was filed by a small number of female Wal-Mart employees who allege that the company denied them equal pay and opportunities for promotion. But the trial court certified them as representatives of a class of 1.6 million current and former female employees. In reversing, the Court explained that the plaintiffs could proceed with their own discrimination claims but could no longer seek to represent other female employees. The decision was a victory WLF, which filed a brief in opposition to class certification. The Court agreed with WLF that Fed.R.Civ.P. 23(a) prohibits certification in the absence of evidence that there are questions of law or fact common to the class.