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Joao Augusto de Araujo Castro -LRB- August 27 , 1919 , Rio de Janeiro -- December 9 , 1975 , Washington , D.C. -RRB- was a Brazilian lawyer and diplomat , serving as Brazilian Ambassador to the US and UN , and Minister of Foreign Affairs during the government of Joao Goulart .. Rio de Janeiro. Rio de Janeiro. Joao Goulart. Joao Goulart. Category  :1919 births. Category  :1975 deaths. Category  : People from Rio de Janeiro -LRB- city -RRB-. Rio de Janeiro. Rio de Janeiro. Category  : Foreign ministers of Brazil. Brazil. Brazil. Category  : Brazilian diplomats. Category  : Permanent Representatives of Brazil to the United Nations. Brazil. Brazil. Category  : Ambassadors of Brazil to the United States. Brazil. Brazil