Maryland’s leading casino operator has sued its newest competitor before it even opened over an allegedly pilfered list of high-rolling gamblers.

Last week, Maryland Live filed a federal lawsuit against MGM Resorts for hiring three former staffers who Maryland Live claims stole the casino’s private database of VIP gamblers.

MGM, which is set to open its $1.3b National Harbor casino next month as the state’s sixth and final gaming venue, is accused of having “aided and abetted this whole scheme” by knowingly hiring the three staffers “with knowledge that they have misappropriated trade secrets and are subject to No Hire/Non-Compete agreements.”

Specifically, Maryland Live alleges that the three former “executive hosts” – two of whom bore the title of Asian Executive Host – stolen names and contact info of players belonging to the top two strata of its player reward system.