On 27 April 1964, Barwick was appointed Chief Justice of the
High Court of Australia, succeeding Sir
Owen Dixon, being the first law graduate from the University of Sydney to hold the position. He was instrumental in the construction of the High Court building in Canberra (unofficially known, as a result, as "Gar's Mahal"), and became the first president of the
Australian Conservation Foundation in 1966. Barwick was one of only eight justices of the High Court to have served in the
Parliament of Australia prior to his appointment to the Court; the others were
Edmund Barton,
Richard O'Connor,
Isaac Isaacs,
H. B. Higgins,
Edward McTiernan,
John Latham, and
Lionel Murphy. In 1972, he became President of the Australian Institute for International Affairs. He was an
ad hoc judge of the
International Court of Justice in 1973–74 in the
Nuclear Tests (Australia v. France) and
Nuclear Tests (New Zealand v. France) cases, representing Australia and New Zealand jointly. A significant decision of the Barwick court marked the beginning of the modern interpretation of the
corporations power, which had been interpreted narrowly since 1909. The
Concrete Pipes case (1971) established that the federal parliament could exercise the power to regulate at least the trading activities of corporations, whereas earlier interpretations had allowed only the regulation of conduct or transactions with the public. The court decided many other significant constitutional cases, including the
Seas and Submerged Lands case (1975), upholding legislation asserting sovereignty over the
territorial sea; the
First (1975) and
Second (1977) Territory Senators cases, which concerned whether legislation allowing for the mainland territories to be represented in the Parliament of Australia was valid; and
Russell v Russell (1976), which concerned the validity of the
Family Law Act 1975. The court also decided several cases relating to the historic
1974 joint sitting of the Parliament of Australia, including
Cormack v Cope (1974) and the
Petroleum and Minerals Authority case (1975). The Barwick court decided several cases on
tax avoidance and tax evasion, almost always deciding against the taxation office. Led by Barwick himself in most judgments, the court distinguished between avoidance (legitimately minimising one's tax obligations) and evasion (illegally evading obligations). The decisions effectively nullified the anti-avoidance legislation and led to the proliferation of avoidance schemes in the 1970s, a result which drew much criticism upon the court. During the
1975 Australian constitutional crisis, he controversially Further, Whitlam had refused Kerr's request for permission to consult Barwick, or to act on any advice except his own. The High Court was due to move to new premises in Canberra in May 1980. A year earlier, in anticipation of the move, Barwick wrote to
Malcolm Fraser (who had become prime minister as a result of the dismissal and who was confirmed in office by the December 1975 election), seeking an official residence in the national capital. His request "went down like a lead balloon with the cabinet which had run into trouble with the High Court's burgeoning costs while urging economic restraint on other Australians", between 1966, and 1980. Barwick insisted on an amendment to Privy Council procedure to allow dissent, however he exercised that only once. The appeals mostly related to decisions from other Commonwealth countries, although they occasionally included appeals from a State Supreme Court. Barwick supported the passage of the
Privy Council (Limitation of Appeals) Act 1968, which closed off appeals from the High Court to the
Judicial Committee of the Privy Council. He said that "Australia needed to make its own legal mistakes". However, it remained possible to appeal to the Privy Council from state supreme courts until the passage of the
Australia Act 1986. ==Personal life==