They are anonymous. No one has seen their faces, but in Mexico, everyone has heard of them. They are the Mata Zetas (Zetas killers), a group that wants to eradicate Los Zetas, a terrifying Mexican drug gang. What are their fighting methods? Exactly the same as those used by their enemies. Who are exactly the Mata Zetas?

It can be said that Mexico is a country of the daily violence where its…