OAKLAND (CBS SF) – The secondhand ticket sales website StubHub is suing the Golden State Warriors and Ticketmaster on a claim that the team and the online ticket dealer are part of an “anti-competitive scheme.”

According to StubHub’s suit, a policy established by the Warriors in 2012 strongly encourages Warriors fans looking to buy or sell after-market tickets to use Ticketmaster’s “Secondary Ticket Exchange,” or possibly forfeit their tickets.

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“The suit alleges that the team has informed season-ticket holders should they resell their tickets through anything other than Ticketmaster’s exchange, NBATickets.com, they will have their ticket privileges revoked,” reports ESPN.

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StubHub says the number of Warriors tickets listed on StubHub has declined by 80 percent over the past year.

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Warriors and Ticketmaster reportedly share fees from the resale market. Neither organization responded to a request by ESPN for comment.