Exclusion of women from the Magic Circle doesn't really look like a mere clerical error...
Genii, vol 41, p 624 (1977):
THE MAGIC CIRCLE of London,
England, won a court battle to keep
women from becoming members.
Morine Vickers tried to join and
when she was turned down she took
the matter before an industrial
tribunal claiming it breached
Britain's new Sex Discrimination
Act. The Magic Circle contended
that it is a social group and does not
bestow professional qualifications
which would bring it under the sex
discrimination laws. After a series of
hearings the Magic Circle won out
and will remain an all-male organization
. . . for the time being.