Ghassan Elashi, a Palestinian, has been in the U.S. for 23 years. A father of six and a devout Muslim who runs the Holy Land Foundation for Relief and Development, he is also a proud U.S. citizen. But lately he has stopped jogging and lives in fear that his teenage daughter--who wears a hijab, a Muslim head covering--will be attacked on the streets of their hometown, Richardson, Texas, a Dallas suburb. Managing the nation's largest Muslim charity, he says, has become a "very, very dangerous" business.
It's the Holy Land Foundation that is truly dangerous, according to U.S. officials who last...