The Trump administration is using an imagined enemy—“antifa”—to justify turning ICE into an ultra-violent, unaccountable army invading US cities. Portlanders deploying inflatable animal costumes, a brass band, mass ukulele renditions of “This Land Is Your Land,” naked bike rides, and other tactics in their ICE protests are undermining the Trump administration’s lurid claims that Portland, Oregon, is a “war-torn” city under siege by a violent left. It’s hard to portray someone dancing in an inflatable frog or chicken costume as a terrorist. This, of course, hasn’t stopped the Trump administration from officially designating antifa a domestic terrorist organization. Secretary of...