Grayden served a total of 43 years in State and Federal Parliament. He was re-elected at the
1951 election but defeated by
Australian Labor Party (ALP) candidate
Harry Webb at the
1954 election. In December 1950 he announced "Operation Corks", a plan to test the impact of pollution from
Fremantle Harbour by dropping hundreds of coloured corks into the
Swan River. In 1953 Grayden led an expedition to Central Australia seeking evidence of the lost
Leichhardt expedition. The 1953 group visited the area around the
Rawlinson Ranges and returned with various indigenous and non-indigenous artefacts, but none were linked to Leichhardt.
State politics: 1956–1993 In
1956, Grayden returned to the Legislative Assembly, winning the seat of
South Perth. Grayden had a strong interest in indigenous affairs. In 1956, he told parliament that the
British nuclear tests at Maralinga "could mean death from sickness or starvation to 800 tribal aborigines", and that it would be difficult to warn them due to their nomadic nature. In the same year he led a parliamentary enquiry into the state of remote indigenous peoples. The resulting report by the select committee was tabled in December 1956, officially called the
Report of the Select Committee appointed to Enquire into Native Welfare Conditions in the Laverton-Warburton Range Area, also known as the
Grayden Report. It brought to public consciousness the dreadful plight of many of the nomadic
Wongi peoples, and after newspaper publicity the affair developed into what became known as the
Warburton Ranges controversy, leading to much public discussion, lobbying of both federal and state governments, and Indigenous activism. The latter contributed to a national movement campaigning for the rights of
Indigenous Australians, including the formation of what is now known as
Federal Council for the Advancement of Aborigines and Torres Strait Islanders (FCAATSI). In February 1957, disappointed by the public reaction to the report, Grayden, fellow
MLA Stan Lapham and Aboriginal pastor
Douglas Nicholls returned to
Ngaanyatjarra with a film camera to document the conditions. The resulting film
Their Darkest Hour (also titled
Manslaughter), shown at public meetings around Australia, was said to have "variously shocked and enraged audiences" and has been called "one of the earliest examples of activist documentary in Australia". Grayden also released a book of black and white photographs titled
Adam and Atoms. In 1974, Grayden was appointed Minister for Labour and Industry, Consumer Affairs, Immigration and Tourism in the government of
Charles Court. In 1976 he introduced legislation that would abolish
compulsory trade union membership. Grayden resigned from the ministry in 1978 following "an early-morning fracas involving two policemen in a Perth hotel", as a result of which he was convicted of assault and wilful damage. He returned to the ministry after the
1980 state election as Minister for Education, Cultural Affairs, and Recreation. Grayden was removed from the ministry in 1982 following Court's retirement and replacement by
Ray O'Connor.
The Canberra Times described him at the time as "the WA Parliament's
stormy petrel" and noted that he expected to spend another 10 or 12 years in politics. He left the Assembly in 1993. ==Personal life and death==