Counterterrorism efforts got a major boost last week when a U.S. district court found three Muslim organizations and one individual, mostly based in the Chicago area, guilty of funding Hamas and fined them an astonishing $156 million. The four were found liable for their roles in the murder of an American teenager, David Boim, on May 13, 1996, when he was shot by Hamas operatives as he waited for a bus near Jerusalem. This case is important in itself, providing some measure of justice and relief for the Boim family. Beyond that, it helps fight terrorism in four ways. First,...