A federal judge has ordered half a dozen federal agencies to “immediately” reinstate probationary employees fired last month as part of the Trump administration’s effort to rapidly shrink the federal workforce.

U.S. District Judge William Alsup Thursday ordered the Trump administration to reinstate tens of thousands of illegally fired federal employees across six federal agencies.

U.S. District Judge William Alsup described the mass firings as a “sham” strategy by the government’s central human resources office.