
The row is escalating over the veil of secrecy surrounding the breach of parole by James Bulger killer Jon Venables.
The Justice Department refused to confirm of deny claims, published in The Daily Mirror, that Venables, now aged 27, is a chronic drug user who twice carried-out violent assaults - the second resulting in his recall to jail.
Other leaks have suggested that he may have been recalled "for his own good" because his mental state was deteriorating.
But Prime Minister Gordon Brown said it would not be in the "public interest" to release details of his parole breach.
The Assistant General Secretary of the National Association of Probation Officers said that if details of Venables offence were to be made public it would "undo a lot of good work" that had gone into his rehabilation and would mean a lot of expense in creating a second new identity for him.
But sources close to Denise Fergus condemned Gordon Brown for saying he "could not comment on individual cases" and called the secrecy surrounging his case to be completely lifted.
The spokesman for Denise Fergus said: "Denise finds it insulting for Gordon Brown to hide behind the excuse that he 'cannot comment on individual cases going through the system'.
"We do not want Gordon Brown to comment on the case. We just want the facts.
"Denise believes that the public has a right to know what offence Venables has committed and what his punishment is to be.
"Venables was given anonymity because he committed an offence as a child.
"Denise believes he should lose that anonymity now he has committed an offence, as an adult, that was a breach of his parole.
The spokesman added: "It seems the Justice Department are making-up the rules for Venables as they go along and that is rubbing salt in the wound for Denise."
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