Chief among the campaigners celebrating the resignation of Claudine Gay as president of Harvard University was a man who arguably did the most to push Gay, Harvard’s first Black president, out of the door: Bill Ackman, a billionaire hedge-fund manager and Harvard alumnus. Ackman, who accused Gay of antisemitism and plagiarism, was a major player in what increasingly became a rightwing campaign against the Harvard president – who said many of the attacks against her were “fueled by racial animus”. In the past month alone, the 57-year-old has tweeted about Gay, Harvard, or both, more than 100 times to his...