ito "); ▁Ó scar ▁Gu err ero ▁Silva ▁( alias ▁" Z - 8 "); ▁O mar ▁L orm énd ez ▁P ital ú a ▁( alias ▁" Z - 9 "); ▁E fra ín ▁Te od oro ▁Tor res ▁( alias ▁" Z - 1 4 "); ▁M ell ado ▁Cruz ▁( also ▁known ▁by ▁his ▁alias ▁" Z - 6 " ▁and ▁" El ▁M ell ado "), ▁among ▁other ▁ex - command os . ▁Through out ▁the ▁late ▁ 1 9 9 0 s ▁and ▁early ▁ 2 0 0 0 s , ▁Los ▁Z et as ▁were ▁the ▁G ulf ▁Cart el ' s ▁military ▁wing ▁and ▁had ▁the ▁task ▁of ▁protect ing ▁C ár den as ▁Gu ill én ▁and ▁killing ▁rival ▁cart el ▁members . ▁ ▁When ▁C ár den as ▁Gu ill én ▁was ▁arrested ▁by ▁Mexican ▁security ▁forces ▁in ▁Mat am or os , ▁T ama ul ip as , ▁on ▁ 1 4 ▁March ▁ 2 0 0 3 , ▁the ▁leadership ▁of ▁the ▁G ulf ▁Cart el ▁was ▁handed ▁over ▁to ▁his ▁brother ▁Antonio ▁C ár den as ▁Gu ill én ▁( alias ▁" T ony ▁Tor ment a ") ▁and ▁Jorge ▁Edu ardo ▁Cost illa ▁S ánchez ▁( alias ▁" El ▁C oss "). ▁The ▁leadership ▁of ▁Los ▁Z et as , ▁on ▁the ▁other ▁hand , ▁was ▁kept ▁under ▁the ▁control ▁of ▁Laz cano ▁Laz cano . ▁However , ▁C ár den as ▁Gu ill én ▁alleg edly ▁continued ▁to ▁command