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The person is a blackmailer.
A knowledgeable person.
A person?
a person
Such a person could be said to be defeated.
You call that person a scholar.
If its your policy, Just call your agent======== If not, Then NO!
You would call them someone who peruses.
an ally
You can call someone who does not lie honest, truthful, trustworthy, or sincere.
someone who works for a business