wausfpp.org
Jao Goulart was president of Brazil from 1961 to 1964. The CIA instituted a destabilization campaign against him, passing money to opposition candidates, distributing propaganda, paying for antigovernment protests, and buliding an anti-Goulart labor union movement. While the US did not aid the Goulart government, it did fund and provide training for the Brazilian military, encouraging anti-civilian sentiment. In 1964 the military overthrew the Goulart regime, ending democracy in Brazil for two decades. Details of US involvement in the actual coup are still classified. At this time it appears that the US was not actively involved in the actual coup events, although it funded the organizations that carried them out, was very supportive in attitude, and willing to provide backup to the coup plotters should it be needed.
After the coup succeeded, the US provided aid to the new military regime, which began a political cleansing operation to rid the country (and other South American countries as well) of leftists of any stripe. A powerful terror state is created with US funding and the sorts of methods one usually finds in the US-backed dictatorships of the era, including electric shocks applied to sexual organs.
Parker, Phyllis R. 1979. Brazil and the Quiet Intervention, 1964. 147 pages. (A great old source for the USG definition of democracy. Describes the coup that ended democracy in Brazil from the USG perspective, using declassified documents. Notice how, throughout, the coup-making military men who overthrew democracy are called "the democratic forces." Since then more docs have been declassified, although the US government still refuses to declassify many docs relating to CIA involvement, according to the National Security Archive:
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...Note: This is how far I got by Oct. 3, 2007. To be continued...