That is my understanding as well. A psychopath is a highly disordered sociopath. Bundy was a psychopath while Stalin was a sociopath.
In hindsight the psychopath's behavior looks crazy and has strong psychosexual elements to it while sociopath's behavior looks ruthlessly opportunistic and exploitative. Compare Ted Bundy to Jeffery Skilling. Skilling was Id'ed as a sociopathic by his own classmates at HGSB during ethics case studies. Skilling, normally a brilliant student, was baffled by the very moral principles the cases represented.
There is a woman named Yolanda in the North East who is all of the above
Interesting.
Do you happen to remember the source for that?