The Justice Department is investigating Elon Musk's SpaceX company over claims of hiring discrimination.
The agency opened the investigation after receiving a complaint that SpaceX refused to hire a man because he was not a U.S. citizen.
According to court filings, SpaceX has refused to comply with subpoenas for documents and data related to its hiring practices.
SpaceX recently conducted its first successful manned launch to the International Space Station.
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