The U.S. Department of Justice is full of deep state operatives. They have continued conducting political witch hunts against vocal conservatives under the Trump administration. Former Attorney General Jeff Sessions did nothing to stop it. The deep state went after Stockman hard because he was a threat. They wanted to silence him and make an example out of him, so others would be hesitant to follow in his footsteps.
https://www.wnd.com/2018/11/the-deep-state-imprisons-another-good-guy/