Arrest could mean death knell for Los Zetas-Gulf Cartel , ex-intelligence executive says . Los Zetas split unleashed `` violence all over San Luis Potosi '' Death of U.S. agent , casino fire brought added Los Zetas , Tamaulipas focus on group . `` This one is particularly toxic . '' Los Zetas include gun and human smuggling , kidnapping on criminal resume .
Arrest could mean death knell for Los Zetas-Gulf Cartel , ex-intelligence executive says . Los Zetas split unleashed `` violence all over San Luis Potosi '' Death of U.S. agent , casino fire brought added Los Zetas , Tamaulipas focus on group . Los Zetas include gun and human smuggling , kidnapping on criminal resume .