The Islamic Society of North America was named by the Justice Department as an unindicted co-conspirator in funding Hamas. It was linked to two Hamas funding fronts, the Holy Land Foundation and KindHearts. ISNA's checks were made payable to the "Palestinian Mujahadeen" or "Holy Warriors" which was a name used by Hamas.
ISNA's co-founder Sami Al-Arian was the local head of Palestinian Islamic Jihad and Mousa Abu Marzook, a top Hamas official listed by the Treasury Department as a Specially Designated Terrorist, received tens of thousands of dollars from ISNA.
This should have come as no surprise as both ISNA and Hamas are arms of the Muslim Brotherhood.