'Chilling': FBI shocks with visits to homes of innocent protesters under Trump's orders

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12. if they show up

Do not let them in your house. Do not open the door. In fact, lock it.
Make them show their badges and ID cards, before you say anything, beyond "hello". If they have to hold it up to a window so you can see it, then do it. And maybe take photos of it and them. Try to record everything.
Tell them you want to verify their identities, and ask for their office number, someone who will verify them.
If they ask why, then you say their IDs look fake. If they give you push back, then say they just verified to you they are not who they say they are. And tell them they are trespassing, and appear to be armed, so you are fearing for your life.
Then say nothing but "get off my property".