https://www.reuters.com/article/us-tech-antitrust-ftc-khan/big-tech-critic-khan-becomes-u-s-ftc-chair-idUSKCN2DR20Y >WASHINGTON (Reuters) -Lina Khan, an antitrust researcher focused on Big Tech's immense market power, was sworn in on Tuesday as chair of the U.S. Federal Trade Commission, a victory for progressives seeking a clampdown on tech firms who hold a hefty share of a growing sector of the economy.