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A corner of Warren Buffett’s business empire is being lassoed into the percolating controversy on real estate commissions.

Reuters reported that Everest Consulting Group LP, an affiliate of Buffett’s Berkshire Hathaway (NYSE:BRK.A) and Anywhere Real Estate (NYSE:HOUS) subsidiaries Sotheby’s and Coldwell Banker are the targets of an antitrust class action filed last week by home sellers in Pittsburgh federal court. The sellers alleged the brokerages overcharged them on commissions because sellers are expected pay to a buyer’s agent as part of a residential home sale.

This is the latest lawsuit that challenges the longstanding real estate commission protocol. In October, a federal court in Kansas City awarded the plaintiffs of a class action lawsuit nearly $1.8 billion in damages for alleged commission overcharging. The National Association of Realtors were among the parties found liable in the Kansas City case, although the trade group is not cited in the Pittsburgh lawsuit.