Sinn Féin is to press PSNI Chief Constable Sir Hugh Orde to reveal full details of a dossier containing evidence of state collusion with loyalist paramilitaries.
With prosecutors having ruled out any charges against soldiers or police officers suspected of involvement in the murder of Belfast lawyer Pat Finucane, Sinn Fein insists there are no further excuses for Chief Constable Sir Hugh Orde keeping details secret.
The party's Alex Maskey will demand complete publication of former Scotland Yard chief Lord Stevens' report into collusion when he meets Sir Hugh at a Policing Board meeting in Belfast tomorrow.
Mr Maskey claimed tonight that full disclosure was in the public interest. The South Belfast MLA said: "It is my clear understanding that there is nothing now standing in the way of the publication of Stevens. "The decision now is solely down to the Chief Constable."
Following three investigations into the activities of loyalist paramilitary agents and informers, Lord Stevens found in 2003 that elements within the police and British army helped terrorists to kill Catholics in the North during the 1980s.
Central to his investigation was the Ulster Defence Association shooting of Mr Finucane in front of his family at their north Belfast home in February 1989.
Files were prepared on at least 20 individuals, but in June this year the Public Prosecution Service (PPS) finally confirmed no charges would follow. Insufficient evidence was said to be critical to the decision, which outraged the Finucane family, campaigners and nationalist political representatives.
Now, however, Mr Maskey believes the authorities cannot justify continuing to shield the full findings.
His challenge is focused on Sir Hugh after the Government appeared to leave the decision with the Chief Constable.
Mr Maskey added: "In April 2002 Stevens said he could not publish his findings because it might undermine prosecutions but since then the PPS has said it will not prosecute any of the 24 members of RUC Special Branch and Force Research at the centre of the Stevens findings.
"Former British secretary of state Peter Hain has said that the demand for the publication of Stevens is a matter for the Chief Constable. "We now need to see this report published.
"Hugh Orde is now in a position to publish this report, a report that was financed by the taxpayer, that is one of the largest and most expensive police investigations in history, that dealt with some of the most controversial murders of the conflict."