Just the facts:

Sociopath Definition & Meaning - Merriam-Webster

Sociopath is from the Latin socius (a companion) and pathos (suffering).  A sociopath may inherited the genes linked to sociopathy, or it may have developed from life situations and experiences.  

In the late 1920s American psychologist George E. Partridge narrowed the definition of psychopathy to antisocial personality and suggest that a more appropriate name would be sociopahy. 

Attributes of sociopathy are: a disrespect for social norms or laws, compulsive lies for personal gain, inability to make long term plans, aggressive or aggravated behavior, and the inability to feel guilt or remorse for their actions. 

A list of most notorious sociopaths would include John Wayne Gacy, Ted Bundy, Joey Buttafuoco, Jeffrey MacDonald, and Jeffrey Dahmer.  The most famous female sociopaths would include Diane Downs and Deidra Hunt.  

In the bad old days, psychiatrists often diagnosed homosexuals as sociopaths because they didn't feel any guilt for being homosexual. This diagnosis often led to lobotomies. This is why the 1973 removal of homosexuality from the Diagnostic and Statistical Manual (DSM) by the American Psychiatric Association was so important.