High Quality Content by WIKIPEDIA articles! The Racial Discrimination Act 1975 is a statute passed by the Australian Parliament during the Prime Ministership of Labor Gough Whitlam. The RDA makes racial discrimination unlawful in Australia and overrides inconsistent States and Territory legislation, making the State or Territory law ineffective to the extent of the inconsistency. The power of the national Parliament to pass this over-riding law arises under the "external affairs" power contained in section 51(xxix) of the Australian Constitution. The power arose from the International Convention on the Elimination of all Forms of Racial Discrimination to which Australia is a signatory. This use of the power in this manner was confirmed in the landmark High Court decision in Koowarta v. Bjelke-Petersen in 1982.