The Trustbuster Who Has Apple and Google in His Sights

Shortly after Jonathan Kanter took over the Justice Department’s antitrust division in November 2021, the agency secured an additional $50 million to investigate monopolies, bust criminal cartels and block mergers.To celebrate, Mr. Kanter bought a prop of a giant check, placed it outside his office and wrote on the check’s memo line: “Break ’Em Up.”Mr. Kanter, 50, has pushed that philosophy ever since, becoming a…