Mad Max: Beyond Thunderdome

Beyond Thunderdome was written and directed by George miller. He's also credited with directing Happy Feet and the other Mad Max's among other random titles that are mostly Australian. The film aesthetically captures the feel of a dusty, irradiated, Australia with ties to the fact that Max lives in the new dark ages of civilization. Each character he interacts with has either adapted to the new life forged from the nuclear waste that has formed. The style even has solid ties to aborigine cultures and traditional adaptions of Australian outback life. Each structure and town he encounters shows how people still live in the husks of former life, trying to literally cobble everything back together in their new normal.

As far as who runs Barter Town goes, while I want to say Master Blaster, It is definitely Auntie Entity. After her successful coup, she rallies Barter Town behind her and even rules lawyers her way into being right even after going back on her deal with Max. Hence why she has a substantial amount of muscle when she pursues Max and co in the final scene.