Unaipon was also involved in political issues surrounding Aboriginal affairs and was a keen supporter of Aboriginal self-determination, including working as a researcher and witness for the Bleakley Enquiry into Aboriginal Welfare and lobbied the Australian Government to take over responsibility for Aboriginals from its constituent states. He proposed to the government of South Australia to replace the office of Chief Protector of Aborigines with a responsible board and was arrested for attempting to provide a separate territory for Aboriginals in central and northern Australia.