An international group of online hackers is warning a Mexican drug cartel to release one of its members, kidnapped from a street protest, or it will publish the identities and addresses of the syndicate’s associates, from corrupt police to taxi drivers, as well as reveal the syndicates’ businesses. The vow is a bizarre cyber twist to Mexico’s ongoing drug war, as a group that has no guns is squaring off against the Zetas, a cartel blamed for thousands of deaths as well as introducing beheadings and other frightening brutality. “You made a huge mistake by taking one of us. Release him,” says a masked man in a video posted online on behalf of the group, Anonymous. “We cannot defend ourselves with a weapon … but we can do this with their cars, homes, bars, brothels and everything else in their possession,” says the man, who is wearing a suit and tie.