Los Hermanos

Los Hermanos
La Manas is a highway gang the was established before the apocalypse. It's possible that they may have had some kind of rivalry with La Manas gang as  Luciana  was initally suspicious of  Nick's  relationship with the gang.

Pre-Apocalypse
Nothing is known about Los Hermanos aside from the fact that they were one of the most fear gang's in Mexico. It's likely that they were involved in several organized crimes such as drug dealing/traficking, murders, and robbery. They also managed to aquire some guns before to outbreak in order to use in any possible situation. It's also possible that they may have had a rivalry with La Manas.