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,

Ticket broker Key Investment Group made millions under the scheme, according to a lawsuit filed by the Federal Trade Commission.