What is "purists"

Usage examples of "purists".

I suppose that this could be annoying to purists of both persuasions, who may feel that I am spoiling an otherwise acceptable science fiction story with the inclusion of the unexplained, or that I am violating the purity of a fantasy by causing its wonders to conform to too rational a set of strictures.

Her long, straight nose somehow managed not to be a disadvantage, even if the purists did think there ought to be some sort of bump or break in it.