Location: Mexico/United States
Scariest fact: They consistently terrorize in the U.S. 
Murder weapons: RPGs, Rifles, IEDs, and GOLD AK-47s.

The Barrio Aztecas originated in prisons in El Paso, Texas in 1986. Soon after they became a transnational gang and rivals to the Sinaloa Cartel. In the beginning, they were considered a street gang, but have transitioned into a paramilitary structured cartel. They're pretty damn ruthless. Barrio Aztecas are responsible for killing a pregnant U.S. Consulate worker in broad daylight and 16 teenagers at a party