According to this story from the Associated Press, the FBI has been on the Mashantucket Pequot reservation, asking about tribal finances.

The money is not the only source of anxiety. FBI agents have been visiting the reservation and asking about tribal finances, according to two people with knowledge of tribal activity who spoke to The Associated Press on condition of anonymity to protect their relationships with the tribe. It all contributes to one of the most tumultuous periods in the recent history of the Pequots, who own and operate the casino that made their reservation one of the wealthiest communities in America.

The story, about the reduction in tribal stipends, says the tribe has told tribal members not to talk to the press.

Tribal leaders have discouraged members from talking with outsiders. A reporter who made a recent visit was stopped by five tribal police officers, including the chief, and escorted off the reservation. The police handed out notices later that day instructing people not to speak with reporters.