Sysco Corp’s $3.5 billion merger with US Foods should be stopped for further review, a federal judge ruled on Tuesday, handing a major victory to the U.S. government in its effort to block the controversial merger. The judge’s decision could ultimately kill the deal between the two largest U.S. food distributors since the further review requested by the Federal Trade Commission is a lengthy process, and deals generally cannot be held together during a full trial. It was not immediately clear if Sysco would appeal.