The former head of Barclays Capital Inc.'s (Barclays) New York foreign exchange trading operation was charged yesterday in an indictment for his alleged role in a scheme to defraud a client of Barclays through a method commonly referred to as "front-running." The charges relate to the manipulation of foreign exchange options in advance of an exceptionally large trade by the Palo Alto, California-based Hewlett-Packard Company.