http://en.wikipedia.org/wiki/North_Sentinel_Island
No social security number, no taxes, no government, no tv, no internet, no radio, only fishing, hunting, eating, reproducing and sleeping.
Here's someone trying to visit them, they're not greeted with love!
https://www.youtube.com/watch?v=kJQuYKYxdVI
Officially, the island has been administered by India as part of the Andaman and Nicobar Islands Union Territory since 1947.[16] However, because there has never been any treaty with the people of the island, nor any record of a physical occupation whereby the people of the island have conceded sovereignty, the island exists in a curious state of limbo under established international law and can be seen as a sovereign entity under Indian protection. It is, therefore, one of the de facto autonomous regions of India.
So are they like cave men?
I'll look at the youtube now....
EDIT:
One of the many gifts include knives?
There's a great plan