The gunmen from Madrazo Cartel are former Vagos gang members. They share the same dialogues and this is implied in the Story Mode. Possibly Madrazo is an OG from the Vagos Gang.
Mexican gang or Guatemalan gang?
I recently played GTA V and I noticed something, out of curiosity I went to the house of Martin Madrazo, and I found the following: members of his cartel were saying the following phrases: (in Spanish: Somos Chapines!, Viva la Guatemala!). Chapines is a word usted by Latin Americans to refer Guatemalan people. Even that many characters refer Madrazo's nationality as Mexican, I have my doubts. Jav*45 (talk) 03:15, November 22, 2014 (UTC)
I found a other interesting phrase usted by a gang member: I am the thoughest chapin, they want to deport me, the boss, to Guatemala.