A federal jury in Manhattan found Wednesday that Live Nation and its subsidiary Ticketmaster operated as a monopoly that harmed consumers and overcharged ticket buyers. Thirty-three states and the District of Columbia sued Live Nation, arguing that the company used threats and retaliation to pressure artists and venues into using their services, including withholding lucrative concert tours from venues that didn’t sign exclusive deals with Ticketmaster. A judge will hold a second trial to determine whether to order a breakup of the company. Live Nation plans to appeal.