The Supreme Court ruled against the plaintiffs (accusers) in the Betty Dukes v. Walmart Stores, Inc. case, ending the largest civil rights class action lawsuit in American history. The court ruled in that way because the plaintiffs failed to meet the “commonality” requirement for a class-action lawsuit. In other words, the plaintiffs couldn’t prove that all of Walmart female employees experienced the same type of discrimination, and their evidence wasn’t strong enough to show that there is a company-wide policy of discrimination against women.