1) Under these circumstances, as described by Cicero in his rhetorical treatise Brutus and supplemented from other sources, where appropriate, we can distinguish two groups of orators at contiones, that is, at informal popular assemblies (2) took place usually before an official vote at a centuriate or tribal assembly, which were the main official assemblies of all Roman citizens (comitia centuriata or comitia tributa): (3) one that undermined the res publica and one that supported it.
Yakobson (1992), "Petitio et Largitio: Popular Participation in the Centuriate Assembly of the Late Republic," Journal of Roman Studies 82, 32-52.
Ultimate electoral sovereignty under the Roman system sprang from two electoral assemblies: the Comitia Centuriata and the Comitia Tributa (hereafter referred to as the Centuriate and the Tribute, respectively).
The Centuriate functioned as a Roman electoral college; it met each year to elect the chief magistrates, including the consuls and proconsuls (governors).
69) Aerarii, citizens excluded from the centuriate
and tribal organization by the censors and subject to the payment of a special poll tax, that is, lowest class citizens.
Particularly insightful is William McCuaig's examination of Augustin's memorandum on the Roman Republican reform of the centuriate