I.e., as open leader of the Occidental Republic. Monygham is trying to stitch the nation together by forcing both the top (Charles Gould) and the bottom (Nostromo) into allegiance; on the deeper level this same process applies to the Devil trying to stitch together idealistic society as such, against the wishes and disillusioned knowledge of both parties.

There is a hint of larger meanings in "come forward," suggesting perhaps that Charles Gould must "come forward" to the humanitarian defense of his wife, and perhaps that he must "come forward" into the doctor's own full cynicism.