I have only heard of two major types of forces in Mexico:
1. the police and military (in which there is lots of corruption, but there are also good guys)
2. the drug gangs (these are all either pure evil or have been forcefully conscripted)
Both are well equipped and have been fighting for many years. I have not heard about any third vigilante-type groups. My first thought is that this is a drug gang being termed a "vigilante group" for the purpose of garnering support in the US from the 2nd amendment backers. However, if it is actually a fed-up citizen militia then that would be a great sign.
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