More than 1,000 Starbucks workers will go on strike at about 65 stores scattered across states as far-flung as California, Texas and Pennsylvania, Starbucks Workers United (SWU), the union representing the workers, told ABC News in a statement.

Starbucks Workers United said its strike may extend past Nov. 13 if the coffeehouse chain continues to ignore their demands.

More than 1,000 Starbucks unionized baristas in over 40 U.S. cities launched an indefinite strike on Thursday, intensifying their push for a collective bargaining agreement over increasing pay and staffing levels at the coffee giant.

A labor strike by more than 1,000 Starbucks baristas in 42 cities has been timed alongside the coffee chain’s annual “Red Cup Day” giveaway.

More than 1,000 unionized Starbucks workers are on strike Thursday at 65 U.S. stores. The strike has closed some stores on Starbucks’ Red Cup Day, which is typically one of the company’s busiest days of the year.

Starbucks Workers United is calling the strike the "red cup rebellion," since the strike coincides with the coffee chain's annual Red Cup Day promotion.

Thousands of Starbucks workers in about 40 cities began striking Thursday on Red Cup Day, the company's biggest sales day of the year.

Starbucks had record setting sales days for the debut of its holiday menu and merchandise and Red Cup Days, CEO Brian Niccol told employees in a memo.

Workers at two unionized Starbucks locations in the Twin Cities walked off the job Thursday afternoon, joining a national strike alleging unfair labor practices that is indefinitely shuttering more than 65 stores across 40 cities.

Workers at multiple Starbucks locations in Atlanta are taking part in a nationwide strike. Employees say low staffing, unstable hours, and wages that fall short of the company's claims pushed them to walk off the job on one of the chain's busiest promotional days.