Webb was best known for his 1996 "Dark Alliance" series of articles written for the San Jose Mercury News and later published as a book. In the three-part series, Webb investigated Nicaraguans linked to the CIA-backed Contras who had allegedly smuggled cocaine into the U.S. which was then distributed as crack cocaine into Los Angeles and funneled profits to the Contras. Webb also alleged that this influx of Nicaraguan supplied cocaine sparked and significantly fueled the widespread crack epidemic that swept through urban areas. According to Webb, the CIA was aware of the cocaine transactions and the large shipments of drugs into the U.S. by the Contra personnel and directly aided drug dealers to raise money for the Contras.