"My friendly, engaging, and generous neighbors are hopelessly anti-gun. They don’t even know about my guns. So what should be done about them in the scenario you illustrated?"
Read the manual:
Total Resistance, originally published in German as Der totale Widerstand: Eine Kleinkriegsanleitung für Jedermann ("Total Resistance: A Guerrilla Warfare Manual for Everyone") is a guerilla warfare manual... written in 1957 by the Swiss army officer Hans von Dach to prepare the Swiss population for an occupation of Switzerland by Warsaw Pact forces
Neither collaborators or sympathizers can be allowed to live in your area of operation.