what was the name for the powerful leaders elected by the plebeians
Plebeian Council The Concilium Plebis (English: Plebeian Council or Plebeian Assembly) was the principal assembly of the ancient Roman Republic. It functioned as a legislative assembly, through which the plebeians (commoners) could pass laws, elect magistrates, and try judicial cases. The Plebeian Council was originally organized on the basis of the Curia. Thus, it was originally a "Plebeian Curiate Assembly". The Plebeian Council usually met in the well of the comitium and could only be convoked by the Tribune of the Plebs. The assembly elected the Tribunes of the Plebs and the plebeian aediles, and only the plebeians were allowed to vote.
Roman dictator A dictator was a magistrate of the Roman Republic, entrusted with the full authority of the state to deal with a military emergency or to undertake a specific duty. All other magistrates were subordinate to his imperium, and the right of the plebeian tribunes to veto his actions or of the people to appeal from them was extremely limited. However, in order to prevent the dictatorship from threatening the state itself, severe limitations were placed upon its powers: a dictator could only act within his intended sphere of authority; and he was obliged to resign his office once his appointed task had been accomplished, or at the expiration of six months. Dictators were regularly appointed from the earliest period of the Republic down to the Second Punic War, but the magistracy then went into abeyance for over a century, until it was revived in a significantly modified form, first by Sulla, and then by Julius Caesar. The office was formally abolished after the death of Caesar, and not revived under the Empire.[1][2][3]