When workers at a Nabisco bakery in Portland, Oregon went on strike on August 10, they weren’t on their own for long. Employees at Nabisco in Aurora, Colorado, and Richmond, Virginia walked off the job within days as contract negotiations dragged on between Mondelez International, the company behind Nabisco products, and the workers’ union, the Bakery, Confectionery, Tobacco Workers and Grain Millers International Union (BCTGM).

Workers say the company is pushing for concessions that include a two-tier health care plan — with newer workers slotted into a worse deal with higher costs — and a reduction in premium pay. At present, Mondelez pays 1.5 the standard rate for hours worked beyond an eight-hour shift, 1.5 on Saturdays, and double pay on Sundays. If the company gets its way, they’d lose such premium pay, a change workers say could cost some of them $10,000 a year.

On August 19, Nabisco’s Chicago shop joined the strike. The plant on the city’s southwest side was the site of mass layoffs in 2016, when the company presented workers with an ultimatum: concede to a 60 percent cut in wages and benefits or face a huge reduction in the workforce. The workers refused; around five hundred people lost their jobs. Some three hundred fifty workers remain.