I can't speak directly for NPCH orgs, as I'm not a part of any. However, my fraternity also has honorary members.
We are an arts fraternity, w/ a special focus on service. There are a few nationally renowned artists (music, theatre, visual arts, etc.) who embody our ideals and character. They are extended honorary membership as an honor and distinction.
Also, our fraternity has numerous alumni chapters. Some honorary members choose to affiliate through and alum chapter also.
I imagine that the African Americans (and/or others) that are honorary members of BGLOs have been given this as a distinction for their positive example and/or work in ______(fill in the blank w/ whatever).
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SilverTurtle@greekchat.com
Phi Beta Fraternity
Phi chapter