Billionaire hedge fund manager Bill Ackman pressed his campaign to revamp Harvard — after helping to force university president Claudine Gay to resign from his alma mater — by backing four alums in their bid to join its board of overseers. Ackman — who has been engaged in a bitter public feud with Business Insider over the publication’s report about his wife’s alleged plagiarism — endorsed the four write-in candidates in an echo of his playbook as an activist shareholder, pursuing board seats at companies to push for changes. “Harvard needs to change. Bringing fresh young blood onto the board...