What are the signs of a sociopath?

Disregard: Sociopaths show a pervasive pattern of disregard for the rights and feelings of others. They often lack empathy although they are usually very good at feigning such. They are also very egocentric, thinking only of themselves.

Antisocial: The modern clinical term for sociopathy is antisocial personality disorder. The hallmark of this disorder is the person seems to have no conscience, or sense of morality, or right or wrong. This person cannot empathize with others, is opportunistic, predatory, and often thrill seeking. An example of this would be Charles Manson.