[Tax-chick]

None of the students were disciplined.

None of the students WAS disciplined.

[Kaslin]

I did a grammar check and found that both "were" and "was" are correct.

You're trying to correct Dr Adams?

[IronJack]

Not true. It is a myth that “none” can only take a singular verb. If the object of the defining preposition (or implicit appositive) is a plural, then “none” takes a plural verb.

In the example cited, “none of the STUDENTS,” the object is “students” — a plural. If the sentence had read “Of the false accusers, none were punished” the same rule would apply.

If the object was singular, e.g.: “None of the shipment ...” or a collective noun — “None of the herd ...” — then a singular verb (is, was) is proper.

Except in British variants that use plural verbs for collective nouns.

End of lecture ... :)