Mexico's government hailed the arrest of Zetas leader Miguel Angel Trevino as a great success
Other influential and violent cartels are the Knights Templar, the Gulf cartel and the Cartel Jalisco Nueva Generacion.
What do the cartels do?
Cartels control much of the heroin, cocaine, methamphetamines and marijuana trades
Mexico's cartels control much of the illegal drugs trade from South America to the United States.