A government social worker for Durham County, N.C., said that the number of Hispanic residents seeking assistance had dropped off rapidly in recent days amid swirling rumors about an ICE checkpoint at a Durham intersection and ICE agents making arrests in a supermarket parking lot. “Today, I haven’t gotten one Hispanic client in the entire check-in today,” said the social worker, a longtime government employee who spoke on the condition of anonymity because they were not authorized to speak publicly.