Senator Elizabeth Warren has long made clear that she’s no fan of Big Tech, and her latest legislation proves it. She and House Representative Mondaire Jones have introduced legislation in their respective congressional chambers that would effectively ban large technology mergers. The Prohibiting Anticompetitive Mergers Act (PAMA) would make it illegal to pursue “prohibited mergers,” including those worth more than $5 billion or which provide market shares beyond 25 percent for employers and 33 percent for sellers.

The bills would also give antitrust regulators more power to halt and review mergers. They would have authority to reject mergers outright, without requiring court orders. They would likewise bar mergers from companies with track records of antitrust violations or other instances of “corporate crime” in the past decade. Officials would have to gauge the impact of these acquisition on labor forces, and wouldn’t be allowed to negotiate with the companies to secure “remedies” for clearing mer