The act that keeps people, countries, or races from work, opportunity, access, or recognition is known as Blacklisting.
Blacklisting is the preparation of a blacklist wherein some people, countries, or races are blacklisted such that opportunities for work, access, or recognition will not be granted by those who prepared the list and similar entities.
There are numerous backlashes from blacklisting, including:
loss of credibility and goodwill
avoidance by the rest of the public
decline in business contacts
increased financial hardship
Inability to function as a member of the group because of exclusion.
The opposite of blacklisting is whitelisting. The latter involves inclusion and acceptance.
Thus, blacklisting makes a person or entity an outcast of a group, to be excluded, and prohibits interaction with the person or entity.