blocos de enredo are regulated by the federação dos blocos carnavalescos do estado do rio de janeiro - fbcerj.

those looking for more information on the rules, classification, and history of these blocks can find lots of information on the website maintained by the federacão dos blocos (block's federation) on this page.  

blocos de enredo are characterized by the acronym grbc before the name of the group, standing for grêmio recreativo bloco carnavalesco, and meaning recreational guild carnival block.

similarly, samba schools are distinguishable by the acronym 'g. r. e. s.' before the name of their organization, standing for grêmio recreativo escola de samba, and meaning recreational guild samba team.