Nabisco workers in five states are on strike over changes to work schedules and overtime being sought by the maker of Oreos, Ritz Crackers, Chips Ahoy! and other popular snack foods, the Washington Post reported. The walkout began on Aug. 10 at a biscuit bakery in Portland, Ore., and has since swelled to about 1,000 workers in Aurora, Colo., Richmond, Chicago and, as of Monday, a distribution center in Norcross, Ga. They are represented by the Bakery, Confectionery, Tobacco Workers and Grain Millers International Union (BCTGM), which earlier this summer was involved in a 19-day strike at a Frito-Lay plant in Kansas. Nabisco’s Chicago-based parent, Mondelez International, continues to produce snacks with nonunion staff even though three of its four U.S. bakeries have been affected by the strike. Unionized workers in all five states are governed by a single contract that expired in May.