SANTA ROSA, Calif. - Vintners have been using byproducts from milk, eggs, wheat and even fish guts in the winemaking processes for centuries. But a new federal proposal could require American wineries to disclose such unsavory items _ used as "fining" agents to remove grit _ as ingredients. The proposal, which could be passed by the end of the year, would require companies to redesign the labels on every bottle to protect people who are allergic to certain foods. Executives at Sonoma and Napa county wineries and their trade groups say few, if any, wine drinkers suffer allergic reactions from...