Alcoholics Anonymous is a fellowship of men and women whose primary purpose is to stay sober and help others to recover from alcoholism. The only requirement for membership is a desire to stop drinking. A.A. work is done by A.A. members on a voluntary basis.
A.A. has no central authority and almost no structural organization. A. A. does operate a General Service Office in New York (which acts mostly as a clearing house for information, worldwide) and local central or intergroup offices.