A strike by Starbucks baristas is expanding, their union said.The strike is due to expand to more than 300 locations on Tuesday, it said.The union wants better pay and said Starbucks had not settled many unfair labor practice cases.A strike by Starbucks workers will expand to more than 300 locations on Tuesday, a union that represents the company's baristas said.Advertisement Starbucks Workers United said on Monday that walkouts by workers would reach new locations like Atlanta and Buffalo, as well as othe ...