By the 1970s, this kind of antisocial behaviour would be defined in DSM-3, the third edition of the Diagnostic and Statistical Manual of Mental Disorders, which is published periodically by the American Psychiatric Association. This behaviour is similarly described in the ICD, the International Classification of Diseases handbook published by the World Health Organization. Both the DSM and the ICD include a version of what is called antisocial personality disorder (ASPD), and most people argue that psychopathy is a severe form of this.
