I did get to meet a sociopath once while working construction. Some of the guys at the company liked to go to music festivals, and you meet some odd folks there. Well one of the guys made friends with this dude who was down on his luck for some reason or another and he got hired on with us.
He was manipulative, but not very good at it. He would shower some people with compliments, like constantly and for pointless things. But if he didn't think you were worth sucking up to he would absolutely refuse to do anything you asked (which he tried to do to the company second before he learned he owned part of the company). He would work slow, was on drugs frequently, and spent any money he got as soon as he could. Money he usually got a week early because he couldn't afford food since he would spend all his money.
Anyway not long after we fired him we learned he had been in prison for sexually assulting a minor, and was back in jail for something else.
Thankfully I wasn't important enough to get his attention, so I never got to interact with him directly.