Wales to inquire into labour shortages, and was appointed a commissioner again in 1913 to inquire into industrial arbitration in New South Wales. During this time he continued to practise law and was employed at Sydney Boys High School. High Court appointment Piddington was one of four Justices appointed to the High Court in 1913. The bench had been expanded from five to seven justices that year, and foundation justice Richard O'Connor had died late in 1912. The Attorney-General Billy Hughes, under Prime Minister Andrew Fisher, took the opportunity to try to stack the court. The Fisher Labor government put forward a constitutional referendum in 1911, proposing to give the federal government increased power over corporations and industrial relations, and to allow it to nationalise monopolies. It was defeated in all states but Western Australia. Fisher held another referendum in 1913 on the same issues, but that was also defeated. In this context, Fisher and Hughes were looking for justices who would have a broad interpretation of the Constitution of Australia, particularly of Section 51, which divides powers between the federal and state governments. If the constitution was interpreted broadly, then the need for referendums might be circumvented. Hughes contacted Piddington's brother-in-law, poet and politician Dowell O'Reilly, to ask about Piddington's view on states' rights. O'Reilly was not sure, and contacted Piddington (who was arguing a case before the Privy Council in London at the time) by telegram. The message reached him in Port Said, Egypt on 2 February. Piddington replied: "In sympathy with supremacy of Commonwealth powers." Hughes then officially offered Piddington an appointment, which he accepted. Both the New South Wales and Victorian Bars, and the press, spoke out against Piddington's appointment. The Bulletin led a strong media campaign against Piddington. William Irvine refused to welcome Piddington as a judge on behalf of the Victorian Bar. Ultimately Piddington resigned from the High Court one month after his appointment, having never sat at the bench. Hughes, who had been widely criticised for trying to stack the court, labelled Piddington a coward after the incident, and called him a "panic-stricken boy". Piddington was one of six justices of the High Court to have served in the Parliament of New South Wales, along with Edmund Barton, Richard O'Connor, Adrian Knox, Edward McTiernan and H. V. Evatt. Later life In September 1913, Piddington was appointed as the chairman of the Interstate Commission