(Reuters) -Workers at a Starbucks (NASDAQ:SBUX) store in Knoxville, Tennessee, voted eight to seven to form a union on Tuesday, becoming the first of the U.S. coffee chain's stores in the South to unionize, a spokesperson for SB Workers United said.
The store became the ninth Starbucks outlet to unionize in the United States, according to the labor group. Last week, workers in a cafe in Seattle, the coffee chain's hometown, voted nine to zero in favor of joining a labor union.
The company runs about 9,000 U.S. locations, with thousands of others operated under licensing agreements. The ballooning union drive comes during a nationwide labor crunch.
Baristas at more than 150 U.S. locations have petitioned a federal labor board for union elections since August, when the union drive went public.
Some investors have asked Starbucks to adopt a neutral stance toward the union, noting that the company spent years building a reputation as an employee-friendly workplace.
Earlier this month, Trillium and a group of other investors with $3.4 trillion under management asked Starbucks in a letter to stop sending anti-union communications to employees.