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News Corporation chief Rupert Murdoch directed his editors to "kill Whitlam" some 10 months before the downfall of Gough Whitlam's Labor government, according to a newly released United States diplomatic report.

The US National Archives has just declassified a secret diplomatic telegram dated January 20, 1975 that sheds new light on Murdoch's involvement in the tumultuous events of Australia's 1975 constitutional crisis.

Entitled "Australian publisher privately turns on Prime Minister," the telegram from US Consul-General in Melbourne, Robert Brand, reported to the State Department that "Rupert Murdoch has issued [a] confidential instruction to editors of newspapers he controls to 'Kill Whitlam' ".

Describing Mr Murdoch as "the l'enfant terrible of Australian journalism," Mr Brand noted that Mr Murdoch had been "the principal publisher supporting the Whitlam election effort in 1972 Labor victory".