The U.S. Department of Justice is suing to break up Live Nation, the parent company of Ticketmaster, over alleged antitrust violations.The lawsuit, joined by 30 states and filed Thursday, follows a DOJ investigation into whether Live Nation maintains a monopoly in the ticketing industry, a probe launched in 2022 and bolstered by fan complaints following a botched roll out for tickets to Taylor Swift's Eras tour."We allege that Live Nation relies on unlawful, anticompetitive conduct to exercise i...