Feynman akapedza mavhiki akati wandei muRio de Janeiro muna Chikunguru 1949. Gore iroro, Soviet Union yakaparura bhomba rayo rekutanga renyukireya, ichigadzira anti-communist hysteria. Fuchs akasungwa semusori weSoviet muna 1950 uye FBI yakabvunza Bethe nezve kuvimbika kwaFeynman. Physicist David Bohm akasungwa musi waDecember 4, 1950 uye akatamira kuBrazil muna Gumiguru 1951. Musikana wake akaudza Feynman kuti aifanirawo kufunga kutamira kuSouth America. Aive nesabatical kuuya kwe1951<unk>52, uye akasarudza kuipedza muBrazil, kwaakapa makosi kuCentro Brasileiro de Pesquisas Físicas. MuBrazil, Feynman akafadzwa nemimhanzi, uye akadzidza kuridza simbi percussion, iyo frigidry bongo.
Gumiguru 1951