The move to ban plastic bags at California grocery and other retail stores has fallen victim in the Legislature to labor's fight with nonunion stores like Walmart and the pending merger of Safeway and Albertsons. The union, fearing the consolidation will kill jobs, has been pushing the Legislature for a "retention bill" to help protect positions, or at least guarantee financial help to workers if they are laid off. "There's no enforcement mechanism to ensure the 10-cent fee stays at the local store and helps the local community," the union said in a letter to Assembly Speaker Toni Atkins, D-San Diego. State Sen.