Susan McKay draws together the threads following the Irish News series on collusion this week:
John Stalker tried to investigate collusion and was thwarted.
John Stevens was obstructed over 14 years but found that it existed during the 1980s, including "the extreme of agents being involved in murder".
Mr Justice Henry Barron’s investigation into the Dublin and Monaghan bombs revealed a chilling network of loyalists, policemen and UDR soldiers who murdered with apparent impunity while the British and Irish authorities were preoccupied with the "real" enemy, the IRA.
Barron was refused access to British intelligence documents he needed.
Judge Peter Cory protested vehemently when the British rushed through legislation making it impossible for the sort of inquiry he had called for to be carried out into the murder of Pat Finucane. The Saville Inquiry was obstructed and evidence willfully destroyed.
A Tyrone coroner was refused access to documents he needed to carry out inquests into controversial murders in the 1990s.
We now know a bit more about what they have got to hide. (Unionist silence the most shameful part of the story, Irish News via Newshound)