Ed Miliband has accused the Daily Mail of propagating an "appalling lie" to smear his dead father as a "man who hated Britain".
In a remarkable attack on the newspaper, the Labour leader said it was overstepping the boundaries of civilised debate by deliberately besmirching and undermining his father Ralph, who died in 1994.
Miliband had earlier demanded a right to reply after the Mail published what he described as a character assassination based on a diary Ralph Miliband wrote when he was a teenager. Although the paper printed the Labour leader's response, it did so alongside an abridged version of the original article and an editorial headlined: "An evil legacy and why we won't apologise".
The editorial reiterated the Mail's claim that Ralph Miliband had "nothing but contempt for Britain's values, traditions and institutions" and suggested that Miliband would like to censor discussion about his father's past. "Chillingly the father's distain [sic] for freedom of expression can be seen in his son's determination to place the British press under statutory control. If he crushes the freedom of the press, no doubt his father will be proud of him from beyond the grave, where he lies 12 yards from the remains of Karl Marx."
The Mail is at odds with Miliband over his support for statutory regulation of the press as proposed by Lord Justice Leveson in response to the phone-hacking scandal. Paul Dacre, the Mail's editor and the chairman of the Press Complaints Commission, the current regulator, is adamant that the industry must be allowed to continue policing itself.