British security authority collusion with Loyalist paramilitaries in illegal activity - including murder - was "endemic," Tánaiste Joan Burton told the Dáil.
Speaking about this week's RTÉ documentary, she said the Government continued to seek independent inquiries into illegal killings - including the murder of Belfast solicitor Pat Finucane.
"Collusion between security forces and paramilitaries was endemic during the Troubles," the Tánaiste said.
The Labour leader was replying to Donegal TD Pádraig Mac Lochlainn who raised the murder of Donegal Sinn Féin councillor Eddie Fullerton in May 1991. Mr Mac Lochlainn said RUC special branch officers drove the killers across the border and guns used were later linked to murders at Greysteel and Castlerock.
Ms Burton said the IRA and Sinn Féin also had responsibilities to cooperate with investigations into cases of the "disappeared" and to investigate child abuse cases.
"Máiria Cahill, for example, is entitled to justice in regard to what happened to her," Ms Burton said.