sentences:  With the emergence of the Red Brigades terror group in the 1970s, Milan was perceived as too dangerous, and the family moved again.Joseph and Ezra headed for Monaco, and David to New York City.Helly Nahmad Gallery, on Madison Avenue, is a company run by David’s son Hillel "Helly" Nahmad, who took over his father’s earlier Davlyn Gallery in 2000.