Los Zetas

On Sunday, May 13, Mexican police found 49 mutilated bodies, believed by some to be migrants, on a road that connects the industrial city of Monterrey with the United States border. The corpses had their hands, heads, and feet chopped off, making them difficult to identify. Drug cartels have increasingly used the public display of corpses as warning to other cartels or criminal organizations. 

From New America Media: MERIDA, Mexico -- In an unprecedented move, Mexican members of Anonymous, the renegade group of hackers responsible for breaching the security of banks, financial institutions and government agencies, have issued a direct challenge to Mexican narcos: Because we can’t fight you with weapons, we will destroy you by destroying your privacy.