eBay-owned ticket resale site StubHub has sued both Ticketmaster and the NBA’s Golden State Warriors for allegedly threatening to cancel the subscriptions of season ticket holders if they try to resell any of their tickets via StubHub. According to the complaint [PDF] filed in a federal court in San Francisco, the Warriors already have a monopoly on primary ticket sales, which are done exclusively through Ticketmaster, and that the team and the ticket company are trying to perpetuate this control over ticket sales “by forcing Warriors fans to use only Secondary Ticket Exchange services provided by the Warriors, through Ticketmaster, for the resale of Warriors tickets.” “They have set out to achieve this illegal outcome for a single purpose: to reap service fees and profits that they could not earn in a competitive Secondary Ticket Exchange environment,” contends the complaint, which alleges violations of the federal Sherman antitrust act and state-level laws in California. StubHub argues that anyone who has a ticket to a Warriors game should be able to sell it on whichever secondary market they choose, but alleges that “To control and profit from the resale of Warriors tickets through such Exchanges, the Warriors and Ticketmaster have cancelled or threatened to cancel fan ticket subscriptions to Warriors season and post-season tickets if fans choose to resell their Warriors tickets over a Secondary Ticketing Exchange that competes with Ticketmaster’s,” which obviously includes StubHub.