Perhaps the Brazilian government will apply to the US government to have the two fugitives extradited if their alleged crimes fall within the terms of the extradition treaty between the two countries? But then again they probably won't bother. The Brazilian constitution prohibits the extradition of Brazilian citizens. This prohibition over rules the 1961/1964 extradition treaty with the USA. While no such constitutional prohibition might protect an American citizen, the Brazilian authorities could hardly expect singular sided cooperation.