Sentence:  For we must number here not only the names of Bushnell , Clarke , and Rauschenbusch , not to mention those of `` the <WSD>Chicago</WSD> School '' and Macintosh , but those of the brothers Niebuhr and ( if America may claim him ! ) 
Meaning of the word marked with <WSD> tags:  any number of entities (members) considered as a unit