Elon Musk’s so-called Department of Government Efficiency (DOGE) has been blamed for a “significant cybersecurity breach” that may have put sensitive U.S. labor data at risk, according to multiple reports.

Daniel Berulis, an IT staffer at the National Labor Relations Board (NLRB), testified in a sworn affidavit that the DOGE team was given sweeping access to the agency’s systems. He offered evidence that DOGE exported large amounts of data from the agency’s systems, risking a breach by foreign adversaries in the process.

Berulis’ lawyer, who shared his disclosure with the Senate, claims that he was threatened with a note taped to his door that included photos of him apparently taken by a drone.