An investigation into staff at the United Nations Relief and Works Agency (UNRWA) has expanded to at least 1,500 individuals with suspected terror links. “The USAID inspector general’s cases, coming in droves, are corroborating the obvious parent-subsidiary relationship between UNRWA and Hamas in Gaza,” a State Department official familiar with the matter told the Washington Free Beacon in an exclusive report. “If UNRWA was not a U.N. organizati…