In bankruptcy filings and consumer complaints, thousands of people across the country make pleas for relief from high-interest loans with punishing annual rates that often exceed 600%.

Although they borrowed small sums online from a slew of businesses with catchy names — such as Loan at Last or Sky Trail Cash — their loans stemmed from the same massive operation owned by a small Native American tribe in a remote part of Wisconsin.

Over the past decade, the Lac du Flambeau Band of Lake Superior Chippewa Indians has grown to become a prominent player in the tribal lending industry, generating far-reaching impact and leaving a legacy of economic despair. A ProPublica analysis found companies owned by the LDF tribe showed up as a creditor in roughly 1 out of every 100 bankruptcy cases sampled nationwide.

That’s the highest frequency associated with any of the tribes doing business in this sector of the payday loan industry. And it translates to an estimated 4,800 bankruptcy cases, on average, per year.