"...the National Association for the Advancement of Colored People (NAACP) is a non-profit organization established with the objective of insuring the political, educational, social and economic equality of minority groups."
Most non-profits that are bigger are formed at the National level as 501c3 status. That is just a legal entity though, where these nonprofits conduct their business can be at their choosing. That...
The NAACP is an exapmle of a "Public Interest" Interest Group. Meaning, their goal is to bring about good policy for society as a whole rather than exclusively benefit its members.