Three major grocery store chains asked the U.S. Supreme Court to block consumers from suing over violating government food labeling rules. Kroger Co., Supervalu Inc. and Safeway Inc. contend that only government regulators can enforce federal and state labeling laws. This comes after consumers in California filed a suit accusing them of concealing that they sold salmon containing artificial coloring. The California Supreme Court cleared the lawsuits to proceed. While the lawsuit concerns fresh bulk products, it has potential implications for packaged products as well.