Usually, none of goes with a noun preceded by the definite article the
None of the people I know...
I wonder if it is possible to have none of people, that is, to omit the? Can you come up with such a context?
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Just to add a reference that proves @stangdon's answer right:
We use none with of before the, demonstratives (this, that), possessives (my, your) or pronouns:
- None of his old friends knew what had happened to him. (Cambridge)
So you definitely need the in your case because none of will always be followed by a particular group of persons or things.