Support WBURSamba School Murder Exposes The Dark Side Of Rio's CarnivalPlay05:19Download AudioLulu Garcia-NavarroFebruary 12, 2014 ShareViviane Araujo, a Salguiero samba school queen, performs at a rehearsal for Carnival in Rio de Janeiro. Marcello da Cunha Freire, vice president of the popular samba school, was murdered last month in a drive-by shooting. (Lianne Milton for NPR)