It’s the largest class action employment lawsuit in US history. The U.S. Supreme Court will review a federal appeals court decision that allowed a single suit to cover women who had worked at 4,400 Wal-Mart and Sam’s Club stores since 2001. Wal-Mart, facing billions of dollars in potential liability, contends the lower court made it too easy for workers with different job histories to band together in a single case. Read more.