We grouped together, and founded a fellowship to teach, practice, and continue learning.
Basically, an organization is a group of people intentionally organized to accomplish an overall, common goal or set of goals. http://www.managementhelp.org/org_thry/org_defn.htm
I would not be practicing Aikido now if not for the USAF and JAA/USA.
Credibility and respect are earned by your behavior, not by your membership in an organization.