Ostracism (noun)

1. The act of excluding someone from a society or group.
2. The state of being so excluded.

Origin:

Late 16th century: via latin from greek ostrakismos, from ostrakon "shell, potsherd" (on which votes were inscribed in ancient athens), from ostreon "oyster".

Examples:

1. The new employee experienced ostracism from his colleagues.
2. He felt the ostracism keenly and left the company soon after.
3. The ostracism of the minority group was a violation of their human rights.
4. The politician was subjected to ostracism by his party.
5. The ostracism of the group led to their alienation and ultimately to their downfall.