The practices of excluding one or more individuals from a group by reducing or eliminating contract with that person, often by ignoring, shunning, or explicitly banishing them, is called

Ostracism

Explanation:

Ostracism was a political act, initiated by Cleisthenes and introduced in the constitution of Athens, allowing for the outright exclusion of any notable person from the society, who threatened the political balance of the state. Individuals affected are usually being sent away temporarily without bringing any charge against them.  

After then years, they can be allowed to come back without any stigma or loss of status. Hipparchus, son of Charmus of Collytus was the first to be ostracized in 488–487 BC

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