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The Federal Trade Commission has filed a lawsuit against Zillow (NASDAQ: Z, ZG) and the Rocket Companies (NYSE: RKT) for what the agency described as “an unlawful agreement that eliminates Redfin as a competitor in the market for placing advertising of rental housing on internet listing services.”

The FTC’s complaint cited an agreement from last February where Redfin agreed to withdraw as a competitor in the online listings market for multifamily rental properties in exchange for a $100 million payment and other compensation from Zillow. The FTC noted that that companies presented this agreement as a “partnership” when it removed Redfin as direct competition for Zillow.

The FTC warned the agreement could create higher prices and worse terms for multifamily unit advertising. The complaint seeks to terminate the agreement while considering either “a potential divestiture of assets or the reconstruction of businesses to restore competition.”

“Paying off a competitor to stop competing against you is a violation of federal antitrust laws,” said Daniel Guarnera, director of the FTC’s Bureau of Competition. “Zillow paid millions of dollars to eliminate Redfin as an independent competitor in an already concentrated advertising market—one that’s critical for renters, property managers, and the health of the overall US housing market. The FTC will do our part to ensure that Americans who are looking for safe, affordable rentals receive all the benefits of robust competition between internet listing services like Zillow and Redfin.”

The companies did not immediately respond to the lawsuit.