You will get a deluge by Googling "sociopathy leaders" and "psychopathy leaders". Most are unfortunately not as quantified as I prefer (and I'm not aware of any longitudinal studies at all), but personally I've experienced enough anecdata corroborating the studies to appropriately take action in my daily life. The exceptions in the business world especially are so rare that they prove the rule. The interesting questions to me, that haven't really been explored as far as I can find, come out of asking why as a species we have evolved to generally enshrine this group as leadership.
