Last month, activists packed the Chicago Teachers Union Center for the annual conference of the National Alliance Against Racist & Political Repression (NAARPR). Attendees gathered to discuss fighting ICE and confronting the Trump administration. Despite NAARPR’s relative obscurity—it was founded in 1973 to agitate for the release of Angela Davis and has since become a catch-all activist organization—the group’s conference featured several high-profile speakers, including Chicago mayor Brandon Johnson, who claimed to have inherited a “white supremacist system.” The event was hosted by the Chicago Teachers Union, one of Johnson’s most aggressive backers. Johnson’s appearance, along with that of several...