Los Zetas
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Los Zetas is a Mexican criminal syndicate, known as one of the most dangerous of Mexico's drug cartels. They are known for engaging in brutally violent "shock and awe" tactics such as beheadings, torture, and indiscriminate murder. Wikipedia
Leader(s): Maxiley Barahona Nadales, Amerigo "Gringo" Romano
Founders: Arturo Guzmán Decena and Osiel Cárdenas Guillén
Founding location: Tamaulipas
Ethnicity: Multi-ethnic, but mainly Mexican and Latino
Membership (est.): 20,000-50,000