This is the official blog of the American Fell Runners Association. This association is new and hasn’t even really gotten started yet, but it may blossom some day. There is no membership or related fees for the association. If you are interested in fell running then just start up by yourself, join with others in your area to set up courses, and use the link/article provided for further information. Good luck!
This Wikipedia article describes fell running, and has useful links to other fell running groups: