the U.S. Supreme Court ruled in a decision that bolsters billions of dollars in claims against Altria Group Inc.'s Philip Morris USA and other tobacco companies. The justices, voting 5-4, said a federal labeling law doesn't shield cigarette makers from suits accusing them of deceiving consumers by describing Cigarettes as "light" or "low tar." The high court also said U.S. oversight of cigarette testing didn't preclude those lawsuits. Light-cigarette suits represent probably the most significant legal threat facing the tobacco industry, with dozens of smoker suits against Philip Morris, Reynolds American Inc.'s R.J. Reynolds Tobacco and other cigarette makers. Light Cigarettes account for More than 80% of the U.S. market, federal figures show.