Sentence:  It was arranged that he would board in the home of one of the old <WSD>members</WSD> of the church , a woman named Catt who , as Wilson afterward found , was briefly referred to as The Cat because of her sharp tongue and fierce initiative . 
Meaning of the word marked with <WSD> tags:  one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)