WASHINGTON — Attorney General William Barr drew sharp condemnation Thursday for comparing lockdown orders during the coronavirus pandemic to slavery. In remarks Wednesday night at an event hosted by Hillsdale College, Barr had called the lockdown orders the “greatest intrusion on civil liberties in American history” since slavery. His comments, at a Northern Virginia event hosted by the school, also criticized his own prosecutors for behaving as “headhunters” in their pursuit of prominent targets and for using the weight of the criminal justice system to launch what he said were “ill-conceived” political probes.