The Cártel de Jalisco Nueva Generación, more simply known as the CJNG first began as operators of the Milenio Cártel under the name of Los Mata Zetas and emerged around 2009 while the Sinaloa Cártel's fight with Los Zetas and the Beltrán Leyvas was reaching it's peak. (With Milenio being a subset of the Sinaloense.)
They made themselves apparent by butchering dozens in a string of corpse-dumps in city highways and claiming that more sweeping of the Zetas ranks would come. It has since been argued many of these initial casualties the CJNG left in their wake were in fact innocents and not connected to organized crime.
Since then they have shot down army helicopters with homing rockets, forged alliances countrywide and swept up territories from coast to coast. In a span of a meager six months the CJNG grew from a small cell of operators to one of Mexico's largest criminal syndicates. Reportedly with ties throughout North, Central & South America, Europe, Asia and even Africa.
This unprecedented rise has allowed them to gain international presence, and they are reputed to be primary suppliers of methamphetamine precursor chemicals, fentanyl and a number of other heavily controlled narcotics to both North America and Europe as a result.
Beyond this and despite holding such gravitas among the criminal underworld, not much is known about the CJNG, it's inner structure, factions, or operators. Media coverage of the organization is limited at best, suggesting they keep a firm grip upon what can and cannot be published about them.
They are not without their problems however, and have recently been embroiled in factional issues of their own as government pressure seeks to clamp down on them with the ushering in of a new president. These issues seemed to first arise with the murder of a Colombian financial operator of the CJNG who was murdered without the permission of Sr Mencho by a man once thought to be Mencho's right hand, a commander known as 'El Cholo.'
Who has since waged war against Mencho and his CJNG within their home state and city, Guadalajara. It has since been said that El Cholo has gained majority control of the city and its street level drug trading, but for how long this will last is certainly up for debate. Murder rates in the city have averaged out at 6 per day, and there is no doubt the CJNG is fighting hard to regain control of the city.
Nor is it any indication the syndicate has weakened at all. Perhaps they have had a splinter, but this is inevitable in the criminal world. Especially when an organization begins to have pressure put on it.
In other states, the CJNG seems to be thriving just as much as ever.