This unique and irreplaceable set of 17 fonds is essential for the construction of the history of exception regimes in Latin America in the second half of the 20th century and for the protection of human rights. It is an indispensable source for knowledge of military government policies and actions. Brazilian historiography of that period, for so long restricted to reports of militants in clandestine organizations and private archives, can now be enhanced by research based on new documents, objects and approaches. It covers information produced by the network of information and counter information on the military regime in Brazil (1964-1985), which today are under custodianship of several public archival institutions in the country. It is linked to other Latin America countries that went through exception regimes, such as Argentina, Chile, Paraguay and Uruguay.