A fan club is a group that is dedicated to a well-known
person, group, idea (such as history) or sometimes even an inanimate object
(such as a famous building). Most fan clubs are run by fans who devote
considerable time and resources to supporting them. There are also
"official" fan clubs that are run by someone associated with the
person or organization the club is centered around. This is the case for many
musicians, sports teams and more.
