A new whistleblower complaint says Elon Musk’s team might be connected to a major data breach at a US government agency that protects workers’ rights.

The complaint was shared by a group called Whistleblower Aid and sent to Senators Tom Cotton and Mark Warner. It comes from Daniel Berulis, an IT worker at the National Labor Relations Board (NLRB).

Berulis claims that staff from a Musk-linked group called US DOGE Service were given very broad access to NLRB systems in early March. These systems store sensitive files about unions and labor disputes. According to Berulis, about 10 gigabytes of data were later removed. “That kind of spike is extremely unusual because data almost never directly leaves NLRB’s databases,” he said in an affidavit.

He also told Reuters that the stolen data may include private business info, union records, and confidential statements. He said logging tools were also tampered with, which made tracking system use harder.

The complaint also says someone tried to log into NLRB systems from a Russian IP address shortly after the DOGE team got access. The login attempts had the correct usernames and passwords, but were blocked by location-based security settings.

Berulis said he and a co-worker tried to report the issue to the Cybersecurity and Infrastructure Security Agency (CISA), but their investigation was shut down by higher-ups. Later, he found a threatening note on his door, along with drone photos of him walking near his home, according to Andrew Bakaj, legal counsel at Whistleblower Aid.

“Unlike any other time previously, there is this fear to speak out because of reprisal,” Berulis told Reuters. “We’re seeing data that is traditionally safeguarded with the highest standards in the United States government being taken.”

The NLRB has denied that there was any data breach.