Sen. Elizabeth Warren (D-Mass.) and Rep. Mondaire Jones (D-N.Y.), introduced a bill Wednesday that would give federal antitrust enforcers greater power to block and break up mergers.

The Prohibiting Anticompetitive Mergers Act would allow the Federal Trade Commission (FTC) and Department of Justice to reject large merger deals without a court order. It would also give the government power to retroactively break up deals that resulted in a market share above 50 percent or “materially harmed” competition, workers, consumers, or small or minority-owned businesses.

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Advocacy groups pushing for antitrust reform to target tech giants cheered the bill.

American Economic Liberties Project Executive Director Sarah Miller said the proposal takes “direct aim at the record-shattering merger frenzy now supercharging the concentration of wealth and power in America.”