Google should sell two of its ad businesses to address antitrust issues, the U.S. Justice Department said in a court filing after a federal judge ruled last month that the tech giant had created a monopoly in advertising, a move that could upend one of the company’s core businesses. Citing a court opinion issued April 17, a court filing dated May 5 said Google unlawfully acquired and maintained monopoly power in the ad-exchange market, which has harmed competition. Source: U.S. Urges Breakup of Google Ad Businesses