Sociopathy and Psychopathy the wikipedia article.
Yes, I know it's wikipedia. I know wikipedia isn't exactly reliable. Still, it's easy and convienient. It also states that there's functionally very little difference between psychopathy and sociopathy. Given the medical definitions and such for each, okay, I'll go along with that.
Now. Lets look at some of this.
They make a superficially good first impression.