The + Adjective
The + adjective = plural noun
the blind
the deaf
the disabled
the healthy / sick
the living / dead
the rich / poor
the unemployed
the destitute
the needy, etc.
Take a plural verb and the pronoun is they
The poor get poorer; the rich get richer.
The unemployed are striking.
Colours take -s like nouns
the blacks
the whites
The + adjective = a singular noun
the accused (person)
the unexpected (thing)
the unknown
the wild
the inevitable