Family of murdered prison officer Brian Stack
Brian Stack thought there may have been insiders in cahoots with the Provos and had confided in a colleague that he had stumbled upon something, that if proven, would rock the State to its foundations.
Fianna Fáil governments made no significant effort to tackle the Provos, e.g. the Arms Crisis of 1970, the Jack Lynch government wouldn't let Gardaí assist the RUC investigation of the Narrow Water massacre, but Fine Gael-Labour coalition governments were tenacious about the campaign against the Provos. That means that no member of the Fine Gael-Labour coalition, which was in government at the time of Chief Officer Stack's murder, could have colluded with the Provos. Therefore, if there was collusion with the Provos in the Prison Service, it could not have been authorised by the government.