Four banks that paid millions of dollars to reimburse credit card customers victimized by thieves who hacked into the computer system of Schnucks, a St. Louis-based company that owns more than 100 stores in the Midwest, sued the grocery chain in federal court based on Missouri and Illinois tort law plus the Illinois Consumer Fraud Act.In addition to alleging negligence by Schnucks in failing to adequately safeguard the credit card data of its customers, the complaint alleged that banks incurred additional losses because of …