The Zetas now Mexico's largest drug gang. Who are they?

2. Why you may have heard of them before

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    A woman holds a photograph of herself and her son who died in an arson attack on a casino in August in Monterrey, December 2011.
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If a sensational attack in Mexico makes US news, chances are the Zetas are the suspects. One of the worst events in Mexican President Felipe Calderon’s five-year strategy against drug trafficking organizations was the arson attack at a casino in Monterrey in August of 2011. Some 52 people were trapped inside and killed, many of them middle aged women. The previous year, 72 migrants mostly from Central America were found killed en masse in the northern state of Tamaulipas, allegedly hauled off buses and killed after refusing to work for the Zetas. They are suspected in the shooting death of a US immigration agent in Mexico last year, as well.

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