Unionized Starbucks baristas voted to authorize an open-ended strike ahead of Starbucks’ high-traffic holiday season, announced Starbucks Workers United on Wednesday.The union said workers are prepared to strike if a contract is not finalized by Nov. 13, which is the company’s Red Cup Day, and strike actions could hit more than 25 cities and escalate if there is a lack of progress.Starbucks Workers United, which represents more than 9,000 workers out of Starbucks’ over 200,000 baristas, has filed more than ...