Hypothetically, I imagine community group chats, whose members also text warnings to other locals not in the chat, and those people then spread the word further. When agents are seen lurking around town, someone sends the word out, and maybe people can even gather in person and follow the agents to warn passersby, film any arrests, remind people of their rights, and protest.
What’s legal and what’s not?
Alternative idea: Everyone has a rifle by their front door and agrees to [redacted] on sight. And signage around the community that clearly states that feds might enter, but they won’t leave.