The National Labor Relations Board has asked a federal court to force Starbucks to cease employing a
"array of improper techniques" against workers engaging in unionization efforts at the coffee chain's locations.
The NLRB's petition, filed Tuesday in a U.S. District Court in western New York,
is the board's third against the corporation since employees at a Starbucks in Buffalo voted to form a union in December,
a first for the retailer's almost 10,000 corporate-owned outlets in the United States.
Since then, at least 151 stores have voted to unionize, and more than 289 have filed with the NLRB to hold elections.