The largest professors’ group in the United States has censured the University of Illinois at Urbana-Champaign over its ouster of professor Steven Salaita. The university withdrew a job offer to Salaita last year after he posted tweets harshly critical of the Israeli assault on Gaza. On Saturday, the American Association of University Professors voted overwhelmingly to censure the university, saying it has “not adhered to generally recognized principles of academic freedom and tenure.”