The Smallest Minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities. - Ayn Rand
Someone did a study awhile back--can't remember where I saw it--that compared sociopathic criminals with politicians and CEOs of major corporations. It turns out that they have mostly the same tendancies and behave in the same fashion.
You may be thinking of work done by Robert Hare of UBC.
Sounds about right.