Ask to buy a large quantity of dope, the informant said, and they’ll shut down their phones. You’ll never hear from them again. That really startled the informant. He knew of no other Mexican trafficking group that preferred to sell tiny quantities. Moreover, the Xalisco cells never deal with African Americans. They don’t sell to black people; nor do they buy from blacks, who they fear will rob them. They sell almost exclusively to whites. What the informant described, Chavez could see, amounted to a major innovation in the U.S. drug underworld. These innovations had every bit the impact of
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