In the eyes of the federal agents who secretly watched him, Alberto Zatarain was a drug dealer who made all the right moves. He had at least three aliases. He switched cell phones every month and drove ugly old cars to avoid notice. After dark, he holed up and watched TV inside a rented matchbox house in Richfield that rattled from low-flying jets. No clubs, no parties, no women. And every few months, when another runner came up from Mexico, Zatarain handed off suitcases of cash -- profits from a booming business that stretched from metro suburbs to farm towns...