The National Labor Relations Board filed a complaint against Google on Wednesday alleging that the company violated U.S. labor law by spying on workers who had organized protests against the company before firing them.

The complaint alleged that Google violated a New Deal-era law that affords workers the right to engage in collective action about issues in the workplace — even if those workers do not belong to a union, according to Bloomberg. It named two employees, Laurence Berland and Kathryn Spiers, whom Google fired in 2019.