Blue Cross and Blue Shield of Minnesota on Thursday sued disgraced pharmaceutical executive Martin Shkreli and his company Vyera Pharmaceuticals over an alleged price-fixing scheme, in what attorneys for the state’s leading health plan said was the first private lawsuit to stem from a sudden and dramatic increase in the cost of a lifesaving drug in 2014.

The 128-page lawsuit, filed in Manhattan federal court, alleged that Shkreli and his former business partner Kevin Mulleady pocketed millions of dollars at the expense of a class of health plans by driving up the price of Daraprim by more than 4,000% overnight and blocking the development of lower-cost generics.