This an old documentary (2003) it drew a lot of attention back then, but NOW it is truly a must see.

A defintion:
a corporation - define as an association of individuals, created by law or under authority of law, having a continuous existence independent of the existences of its members, and powers and liabilities distinct from those of its members.

An expert:
Dr. Robert D. Hare is a researcher renowned in the field of criminal psychology. He is professor emeritus of the University of British Columbia where his studies centered on psychopathology and psychophysiology. He developed the Psychopathy Checklist (PCL) and Psychopathy Checklist Revised (PCL-R), used to diagnose cases of psychopathy and also useful in predicting the likelihood of violent behavior. He advises the FBI's Child Abduction and Serial Murder Investigative Resources Center (CASMIRC) and consults for various British and North American prison services.

A clinical diagnosis:

The Corporation:
Here is the full documentary on vimeo