In 2007, the Ngarrindjeri, established a formal peak body called the Ngarrindjeri Regional Authority, which was a reflection of the traditional governance of Ngarrindjeri.
Ngarrindjeri have always had a system of peak governance. Different groups within the community have leaders who speak authoritatively. Those elders and leaders come together to make decisions in relation to cultural issues.
The decision-making that had been occurring since colonization was basically very limited in relation to interaction with government, right up until the 1960s. There was a referendum, which led to more rights for indigenous peoples. So really, it's only very recent.