Hughes defeated the long-serving
Labor member
Les Haylen to unexpectedly win the seat of
Parkes at the 1963 election. He switched to the
Division of Berowra at the
1969 federal election. He served on the Joint Standing Committee on Foreign Affairs from 1964 to 1969. In August 1969, he represented
Alexander McLeod-Lindsay at a special inquiry into his conviction for attempting to murder his wife, arguing there had been a mistrial.
Attorney-General Hughes was appointed Attorney-General in the
second Gorton ministry in a major reshuffle after the 1969 federal election. In May 1970, Hughes publicly spoke in favour of decriminalising homosexuality, in the context of the drafting of new
criminal codes for the
Australian Capital Territory and
Northern Territory. In the same year he supported
Rae Else-Mitchell's call for federal and state courts to be merged into a single judicial system. In 1971, Hughes led the Commonwealth's successful case in
Strickland v Rocla Concrete Pipes Ltd, an appeal to the
High Court from a
Commonwealth Industrial Court decision, which marked a significant expansion of the federal government's
corporations power. At a speech to the
Australian National University's Liberal Club in September 1970, he was interrupted by anti-war demonstrators and "grabbed a
Vietcong flag from a student and tore it from its supporting pole". The previous month his home in
Bellevue Hill had been invaded by anti-war demonstrators, resulting in eight students and two press photographers being arrested. He reportedly "came out carrying a
cricket bat and scuffled with some of the demonstrators" before performing a
citizen's arrest on one student. Hughes was charged with unlawful assault in relation to his use of the bat, but was found not guilty by reason of provocation. Hughes supported
John Gorton in the
1971 leadership spill and was not retained as attorney-general when
William McMahon replaced Gorton as party leader and prime minister. He later spoke of a "feeling of having been wronged" over the demotion. In August 1971 he opposed McMahon's attempts to sack Gorton from the new ministry, describing them as "bordering on the insane". Hughes quickly returned to his legal practice, appearing before the
Supreme Court of the Australian Capital Territory a few months after his sacking. He was opposed for Liberal
preselection in October 1971 by four other candidates, winning a majority on the first ballot.
The Canberra Times reported that his bid for renomination was opposed by the conservative faction led by
Jim Cameron, and that since leaving the ministry his comments "had established him as one of the principal spokesmen for the 'radical wing' of the Liberal Party". In November 1971, Hughes announced his decision to retire from federal politics at the next election, citing a desire to return to practising law full-time. ==Later career==