Answer:
They could veto any law or action of a magistrate.
Step-by-step explanation:
Tribunes of the plebs held a powerful position in the Roman government because they could veto any law or action of a magistrate.
This gave them the power to make a law not happen or action - they could allow it or not to become official. It's important that these people work in the citizen's BEST interest - because it could protect them from a harsh law coming upon them.
Therefore, Tribunes of the plebs were so powerful in Roman government because they could veto any law or action of a magistrate.
-kiniwih426