The Justice Department and National Association of Realtors tangled on Friday in an appeals court over the government's decision to close, and then re-open, an antitrust investigation into the way people pay the thousands of dollars in fees when they buy or sell a home. The Justice Department, during the Trump administration, closed an investigation into the realtors organization. The Biden administration re-opened it in 2021 so it could probe how broadly housing listings are available and what fees home sellers pay to the brokers who represent buyers.