The EZLN , in Spanish EjÃ rcito Zapatista de la LiberaciÃ n Nacional , or Zapatista Army of National Liberation is a human rights organization led by the indigenous people of the Chiapas Mountains in the southeast of Mexico . The Zapatista Army of National Liberation ( EjÃ rcito Zapatista de LiberaciÃ n Nacional , EZLN ) is a revolutionary leftist group based in Chiapas , the southernmost state of Mexico .