The dispute began after 18 former Scouts filed suit in 2012 against BSA and its Chicago-area council, alleging sexual abuse by Scout leader Thomas Hacker between 1980 and 1988. National Surety, which had issued excess liability insurance policies to BSA, filed a seven-count complaint in Illinois seeking a declaration that it had no obligation to provide coverage. The suit named BSA, the Hacker claimants, and 19 other insurers, including Allianz Global Risks U.S. Insurance Company, which had settled with BSA.