Following the death of both parents, the Klinghoffers' daughters established the Leon and Marilyn Klinghoffer Memorial Foundation with the Anti-Defamation League. The foundation combats terrorism through educational, political, and legal means. The foundation is funded by an undisclosed settlement paid by the PLO to the Klinghoffers to settle a lawsuit seeking damages for the PLO's role in the hijacking ("Klinghoffer v. PLO", 739 F. Supp. 854 (S.D.N.Y. 1990) and "Klinghoffer v. PLO", 937 F.2d 44, 50 (2d Cir. 1991). This lawsuit spurred passage of the Antiterrorism Act of 1990, which made it easier for victims of terrorism to sue terrorists and collect civil damages for losses incurred.