One of the most interesting problems of pre-colonial history is the relation of so-called secret societies to indigenous government. In West Africa they are concerned mainly with the ownership and use of supposedly supernatural medicines and the propagation of certain cults.
These are the functions also of other associations, but what principally distinguishes secret societies from the ordinary medicine society or cult is the esoteric basis of their activities. Not only do the secret societies employ particular rituals, signs, symbols, and forms of knowledge which are withheld from non-initiates, but these things are regarded as a special source of power through being kept private. Associations of this kind are prevalent in southern Nigeria, and are particularly numerous in the coastal area of rain-forest in general, including the Ivory Coast, Liberia, Sierra Leone, and parts of Ghana and Portuguese Guinea. They are not secret in any other respect. On the contrary, not only is the existence and general purpose of these societies known to every grown-up person, but in many places the wide range of their activities makes them the dominant social force. They are frequently responsible for tribal education, regulate sexual conduct, supervise political and economic affairs, and operate various social services, including entertainment and recreation as well as medical treatment.