After Starbucks fired seven workers who were trying to unionize their Tennessee store, a U.S. government agency obtained a court order forcing the company to rehire them. Now, Starbucks wants the Supreme Court to curb the government’s power in such cases.

On Tuesday, justices are scheduled to hear Starbucks’ case against the National Labor Relations Board, the federal agency that protects the right of employees to organize. If the court sides with Starbucks, it could make it tougher for the NLRB to step in when it alleges corporate interference in unionization efforts.