In its search for a leader the [small therapeutic] group finds a paranoid schizophrenic or malignant hysteric if possible; failing either of these, a psychopathic personality with delinquent trends will do; failing a psychopathic personality it will pick on the verbally facile high-grade defective. I have at no time experienced a group of more than five people that could not provide a good specimen of one of these.

W. R. Bion, Experiences in Groups and Other Papers (London: Tavistock Publications, 1961), p. 123