People picketing outside a Starbucks store in New York's East Village in 2023 during the last Starbucks Workers United strike.Spencer Platt/Getty ImagesStarbucks' biggest workers union on Tuesday went forward to authorize a nationwide strike.It said that the coffee chain had not settled hundreds of unfair labor practice cases.Starbucks said that the union considering a strike was "disappointing."Starbucks Workers United, the coffee chain's largest union, said workers have authorized a nationwide strike.The union, which represents more than 10,000 baristas, said in statements on Tuesday that 98% of its member baristas had voted to strike.