"Historical examples include such monsters as Stalin,
Pol Pot, Ivan the Terrible, and Caligula. While there are many
that make it to the pinnacle of the political stage there are also
such historical figures as J.P. Morgan, Randolph Hearst, and
Mayer Rothschild, professional psychopaths that reach the
pinnacle of the financial stage where they cause no less misery
and destruction as their political counterparts."

Okay, author's playing an armchair psychologist now.