The specific warning signs is a complicated issue, and very hard to answer unless things proceed more or less exactly the way they did in the Dritte Reich, the Red Terror, or other historical case of mass inhumanity to man. By the time they are loading people into rail cars, it is too late.
We always plan for the worst. It is a sensible thing to do when one lives in wilderness. We always have lots of food, water, fuel, firewood, and ammunition.
