Over the course of three years, MGM Grand took in more than $4 million in cash from an illegal bookmaking operation that federal officials say its former president allowed to operate freely within the casino.

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The hotel-casino also went so far as to offer free golf trips with other high rollers to now-convicted illegal bookmaker Wayne Nix and other complimentary benefits such as comping his room and extending him gambling credit to encourage him to spend his money at the MGM Grand, according to federal documents unsealed Thursday as part of the criminal investigation into former MGM Grand President Scott Sibella. These high roller events were called “Undercover Weekends” — a reference to Sibella’s appearance on the reality television show “Undercover Boss.”