The U.S. government has suspended Microsoft and Adobe from a green-card labor program as part of a crackdown on foreign worker hiring, according to reporting from CNBC and the BBC. The move targets two of the country’s largest technology companies and signals heightened federal scrutiny of how such firms use immigration pathways to recruit staff from overseas.

Labor Secretary Keith Sonderling cited “multiple active federal investigations” around the two companies’ involvement in the program, CNBC reported. The announcement was made Thursday, though the sources do not detail the specific nature or scope of those investigations.

The BBC reported that the international visa program at the center of the suspension has for years allowed U.S. tech companies to hire highly skilled workers from abroad. Such programs have long been used by the technology sector to fill specialized roles, making any restriction on access significant for affected employers.

The suspension forms part of what has been described as a broader foreign worker crackdown. The sources do not specify how long the suspension will last, what conditions the companies must meet to be reinstated, or whether other firms could face similar action.

At this stage, the available reporting does not include responses from Microsoft or Adobe, nor additional detail on the outcomes or timelines of the cited federal investigations. Further information would be needed to assess the full impact on the companies and their foreign workforce.