I am having difficulty with finding the natural word order in the following passive construction:

What are people called who do a lot of unnecessary work?

What are called people who do a lot of unnecessary work?

What are people who do a lot of unnecessary work called?

If I change passive to active, the sentence becomes natural:

What do you call people who do a lot of unnecessary work?

What does one call people who do a lot of unnecessary work?

But what is the preferred/natural word order, if any, in such sentences, provided I want to stick with the passive?

I was unable to invent a more generic and to-the-point title. Please fell free to edit if you do.