Not much to say here to add more context. I have been suspicious about the grown-ass men with backpacks stopping off next door, for only a few minutes, multiple times a day.
Today one of them busted into their yard at a full sprint, with a taped up bag of what I can charitably describe as, "powdered sugar."
My big problem is: I don't want to call Angry Men With Guns to my home.
They've got a lovely track record of shooting dogs and crybullying us about how sad it made them. To put it in perspective, they tried putting up NEIGHBOURHOOD WATCH COPS signs, and they got vandalized. The signs are 5m up in the air—somebody needed to set up a ladder to make that happen!
Honestly: what do I do here? Cops aren't an option and I don't want to be dead.
Unfortunately there isn't really much you can or should do. In a situation like this you want to make sure you and yours stay safe, so just mind your own business, pretend you know nothing and saw nothing, don't get in their way and if you get wind that the cops are about to bust them make sure you're not home, cause cops are likelier to shoot bystanders and neighbors than they are actual criminals. Though depending on where you live it may even be the case that the cops just don't give enough of a shit about low level operations like this to even bother. Sorry if this is not very helpful, it sucks that you are in this situation.