Are whoever, whichever and whatever relative pronouns?

Question

Are whoever ,whichever and whatever relative pronouns which is used to modify nouns in adjective clauses?

eg:

1. Most workers, whoever was not employed by the auto manufacturer, toiled at one of the millions of little minnow companies.

2. The three approaches, whichever works is fine, produce a more ambiguous picture of a man.

3. Any excessive profits, whatever exceeded accepted limits, would attract the notice of representatives.

Are these sentences correct? And can we use whoever, whichever and whatever as relative pronoun?

Answer 1

These are indefinite relative pronouns, meaning they don't refer to a known noun. I've heard it say that they are the expanded form of the relative pronoun.

Since you are calling out workers in the first sentence, I believe you don't need the "ever".

Most workers, who were not employed by the auto manufacturer, toiled ...

And if you left off workers

Whoever was not employed by the auto manufacturer, toiled ...