The new head of the Zetas drug cartel is a former Dallas resident who is scorned as a traitor by many of his own cartel soldiers and mocked as an ex-"car washer" by his enemies, but has risen to power thanks to a fearsome reputation for violence. "[Miguel Angel Trevino Morales] is extremely brutal, to the point of sadism," says George Grayson, an expert on the Zetas.

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