In a press conference on Tuesday, Chad Wolf, the acting head of the Department of Homeland Security, responded to media reports that unidentified federal agents using unmarked vehicles have been arresting protesters in Portland, Oregon. Since early July, men in military-style uniforms have waged battle against protesters there ... with what looks like a regular army moving on unarmed protesters night after night. On behalf of the D.H.S. and its uniformed services, Wolf claimed responsibility for the armed presence in Portland. He asserted that his agency was doing exactly what it was created to do. He was right. The original proposal for the D.H.S. described the agency as a new government structure to protect against invisible enemies that can strike with a wide variety of weapons"; one hypothetical example of an invisible enemy was "a non-citizen that intends to enter our nation and attack one of our chemical facilities." The nation used to protect itself against other nations and their hostile military forces, but now it had to fear individuals. This is the premise on which secret police forces are built. The secret police, even when it looks and appears to act like an army, always has a single individual as its target. As we learn more about what is happening in Portland - as footage of federal troops waging war on protesters floods social media ... we are watching the perfect and perhaps inevitable combination of a domestic-security superagency and a President who rejects all mechanisms of accountability.