We live in ugly times — made uglier, and ever more violent, by the institutional left. White House deputy chief of staff Stephen Miller didn’t mince words this weekend: “There is a large and growing movement of leftwing terrorism in this country,” he declared on X. “It is shielded by far-left Democrat judges, prosecutors and attorneys general. The only remedy is to use legitimate state power to dismantle . . . terror networks.” Progressives like Stephen King shrieked “extremist!” in response, but example after example backs Miller’s point. In Chicago on Saturday, a mob of protesters surrounded ICE agents on...