if the sentence reads
these are members whom have been referred
or should it be
who have been referred
I think WHO is correct, but WHOM is wrong, because the word is the subject of the verb "refer", even though the verb is in passive voice. It's just like "He is the teacher who was criticized". You don't say He is the teacher whom is criticized. The only difference is the tense (present perfect tense in passive voice), but that doesn't change the nature of the sentence.