What is the meaning of ostracize as used in the passage citizens could vote to ostracize a leader, whom they believed, had become too powerful, or potentially dangerous to democracy?

In the passage, the term "ostracize" means to exclude or banish a leader from a community or society. This action is taken by citizens through a voting process, based on their belief that the leader has acquired excessive power or poses a potential threat to democracy. By ostracizing the leader, the citizens aim to remove the individual from their position of influence or authority.