What group of people served on the tribal assembly?

The tribal assembly in ancient Rome was primarily composed of the plebeians, or common citizens, who had the right to vote on various issues, including laws and the election of certain officials. This assembly served as a platform for the plebeians to express their interests and influence governance, particularly through the election of tribunes who protected their rights. The assembly was a crucial element of the Roman Republic, helping to balance the power dynamics between the patricians (aristocratic class) and the plebeians.