The Federal Trade Commission accused a shadowy group of flooding Ticketmaster with fake accounts to purchase and resell tickets to concerts by Taylor Swift, Bruce Springsteen and other top artists.

A ticket-reselling operation used a network of fake accounts to bypass Ticketmaster’s security protocols to grab hundreds of thousands of tickets to hugely popular tours for artists like Taylor Swift and Bruce Springsteen and then re-sold them for millions,

The FTC lawsuit claims the reseller used fake accounts and banks of SIM cards to snag over 379K tickets from Ticketmaster in just over a year.