"they performed a dance of exorcism around the fire"
A religious exorcism
Public DomainA religious exorcism - Credit: Gerald Farinas

In its original Greek sense, exorcism means binding by oath, and is typically a religious act only to be performed by priests.  However, many tribes in both Europe and Asia will perform exorcisms as rituals.  The goal of an exorcism is to drive out ghostly demons and spirits, often from a particular person. 

Exorcisms were rarely conducted until the 1900s. In the 1970s, studies showed a massive 750% increase in the practice.  Catholic priests were keen practitioners.  In the case of tribes, there is almost always at least one shaman who oversees magic and expels demons.