1) Gough Whitlam
2) Malcolm Fraser
3) William McMahon
4) Bob Hawke
Explanation:
On May 16, 2019, the former 23rd Prime Minister of Australia, Bob Hawke passed away aged 89 at his home in Sydney, Australia. He was unwell for months. He led the Labor Party from 1983 to 1991. He was born in Bordertown, South Australia on December 9,1929.He won the federal elections 4 times and was the longest serving prime minister after Robert Menzies and John Howard.