ALEXANDRIA, Va. — The leader and members of an international heroin trafficking ring have been charged with using couriers to smuggle heroin from Ghana into the United States, a sign of the growth of West Africa as a major hub for international drug trafficking. Today's charges were made public after coordinated arrests in Ghana, Maryland, and New York assisted by special agents with U.S. Immigration and Customs Enforcement's (ICE) Homeland Security Investigations (HSI).