Los Zetas is a fractured Mexican criminal syndicate and designated terrorist organization, 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. While primarily concerned with drug trafficking, the organization also ran profitable sex and gun rackets. Los Zetas also operated through protection rackets, assassinations, extortion, kidnappings and other illegal activities. Although the organization was founded in Matamoros, Tamaulipas, they eventually established themselves in Nuevo Laredo, directly across the border from Laredo in Texas during the mid-2000s. The origins of Los Zetas date back to the late 1990s, when commandos of the Mexican Army deserted their ranks and began working as the enforcement arm of the Gulf Cartel. In February 2010, Los Zetas broke away and formed their own criminal organization, rivalling the Gulf Cartel.