The Brazilian Intelligence Agency (Agência Brasileira de Inteligência; ABIN) is the successor organization to the Serviço Nacional de Informações (SNI) or National Intelligence Service formed during the government of Humberto de Alencar Castelo Branco in the mid-1960s.
Initially intended to be a civilian agency, the SNI was quickly co-opted by the military and each branch of the armed forces (army, air force and navy) continued to operate independent intelligence services. Through the Destacamento de Operações de Informações—Centro de Operações de Defesa Interna (DOI-CODI) The SNI is believed to have participated with the CIA and the intelligence agencies of other Latin American nations in Operation Condor, intended to oppose the spread of left-wing ideologies and communism throughout the region.
In another attempt to bring intelligence agencies under the control of the civilian-led government as part of the process of democratization begun in Brazil in 1985, President Fernando Collor de Mello replaced the SNI with the shortlived (1990–94) Secretaria de Assuntos Estratégicos (SAE) or Strategic Affairs Secretariat. However, despite the dismissal of 144 SNI officers, the agency contained to be dominated by the military and effective oversight and control of the country's intelligence activities eluded the civilian government.
However, successive governments have taken a number of steps to reduce the influence of the armed forces and related intelligence agencies in domestic politics. The relationships between these groups and government in Brazil, so closely intertwined for decades, is evolving. The focus of intelligence agencies appears to be moving slowly from managing internal dissent to focusing on external threats and support of the nation's democracy.