A secret document compiled by RUC Special Branch claimed that former SDLP leader Mr John Hume and three colleagues worked as agents of the Government at the time of Bloody Sunday.
The intelligence paper, which was submitted to the Blood Sunday inquiry in Derry today, also claimed that then taoiseach Mr Jack Lynch had promised funds to groups working to overthrow the Stormont government.
The document said Mr Lynch had paid money to the SDLP and mentioned Mr Hume, then a leading member of the party, and colleagues Mr Ivan Cooper, Mr Austin Currie and Mr Paddy O'Hanlon as intelligence officers.
"It is also worth recalling previous intelligence to the effect that Mr Lynch's intelligence officers in Northern Ireland are Messrs Cooper, Currie, O'Hanlon and Hume, the latter now having publicly stated that only a united Ireland will satisfy the minority," the report said.
The Special Branch assessment for the period up to February 3rd, 1972 claimed the shooting of 13 civilians on January 30th in Derry occurred after soldiers were fired on by snipers operating from flats in the Bogside.
It added that prior to a civil rights march in the city, there had been reliable intelligence that the IRA intended to exploit the presence of crowds as cover for their gunmen.
Mr Hume later described the claims as "nonsense" and said the RUC dossier was evidence of the RUC's "lack of knowledge of the Nationalist community".
Former Special Branch Detective Chief Inspector Samuel Donnelly, giving evidence to the inquiry today, said he had no memory of intelligence relating to the intentions of either wing of the IRA on Bloody Sunday.
Mr Donnelly said: "I have no recollection of any intelligence or information received from any source about the movements of the IRA or any other organisation before Bloody Sunday.
"Specifically I do not recall what information, if any, Special Branch received about the likely actions of the IRA on the day or the sources of any such information."