The story
Founded by Yves Guérin-Sérac on Sep 1966.1
History
The agency was probably established by the Estado Novo as a response to the Portuguese defeat in the anti-colonial war with India and the subsequent Annexation of Goa. The regime was determined to hold on to its remaining colonial possessions in Angola, Mozambique and East Timor, and feared communist subversion in the form of Soviet support to anti-colonial movements, pushing the regime closer towards NATO security doctrine regarding these movements. This agency is alleged to have carried out work for various right-wing authoritarian governments (including Salazar, Francoist Spain, the Suharto regime in Indonesia, the Greek military junta of 1967–1974, etc.) and the South African Apartheid regime. Its agents worked under the cover of reporters or photographers, which allowed them to travel freely.
1969 Piazza Fontana bombing
Italian magistrate Guido Salvini, in charge of the investigations concerning the 1969 Piazza Fontana bombing, explained to the Italian senators that:
In these investigations data has emerged which confirmed the links between Aginter Press, Ordine Nuovo and Avanguardia Nazionale... It has emerged that Guido Giannettini [one of the neo-fascists responsible for the bombing] had contacts with Guérin-Sérac in Portugal ever since 1964. It has emerged that instructors of Aginter Press... came to Rome between 1967 and 1968 and instructed the militant members of Avanguardia Nazionale in the use of explosives.
From Wikipedia’s article on Aginter Press, shared under CC BY-SA 4.0.3