A secretive group of tightly connected Muslim charities, think tanks and businesses based in Northern Virginia were used to funnel millions of dollars to terrorists and launder millions more, according to court records unsealed yesterday. An affidavit from Homeland Security agent David Kane said that the Safa Group, also known as the SAAR network, in Herndon had sent more than $26 million in untraceable money overseas and that leaders of the organization "have committed and conspired to . . . provide material support to foreign terrorist organizations." The probe of the Herndon groups is the largest federal investigation of terrorism...