Ostracism as a procedure under the Athenian democracy in which any citizen could be expelled from the city-state of Athens for ten years.
The word “ostracism” continues to be used for various cases of social shunning.
Ostracism was crucially different from Athenian law at the time; there was no charge, and no defence could be mounted by the person expelled.
Ostracism rituals could have also been an attempt to dissuade people from covertly committing murder or assassination for intolerable or emerging individuals of power so as to create an open arena or outlet for those harboring primal frustrations and urges or political motivations. The solution for murder.