But soooooo... like questions then: what do the vigilantes know of each other personal lives? And what kinda 'underground subversive system' are they using to keep in touch and gather goods and message each other in underground subversive system secrets shhh? And is this... "contained?" Like for story sake, we dun have to worry about anything that happens in the rest of the world, right? LIke within reason, right?
Sorry, I completely missed your question before. The vigilantes aren't organized, there's no official league. If you want to form something like that within the RP, it's a good plot point to move towards. You can certainly collaborate with other RPers on meeting up and that sort of thing, but unless your characters come from the same occupation/background, have very public/infamous positions, or you've worked something out beforehand, no one in the RP will automatically know each other; and your characters would have to develop those secret communication methods themselves.
Contained is within reason, yes, I'd say that's an accurate description. If, for example, someone kidnaps a diplomat or VIP, the FBI will most certainly be involved. Of course the FBI can be bribed, however, player characters may not always be so easy.
People can mention tidbits about politics or things going on in the world if they want, but generally they won't have any substantial effect on Carcer unless we agree upon something maybe in a timeskip or some such thing. If, for example, a villain tried to acquire a nuclear weapon, well... first of all that would be a stretch, but secondly it would definitely warrant intervention by the cavalry and I don't think any amount of bribery could influence that level of security.
So unless you specifically want to bring something in for sake of story from outside of Carcer (cartels, supply lines, backup characters, other resources, etc), generally speaking there will be little effect.