In the later 1900s, there was a guy named
Roch Thériault (you can read the linked Wikipedia page for information). Now, in my opinion, he was one of the most charismatic and manipulative people of all time, and importantly, he was a real person.
Roch Thériault was the leader of a cult, which was first advertised to be a social awareness campaign but soon turned to a cult. He was responsible for destroying lives. He was a highly charismatic person. A lot of females were also in the cult with him. He cheated on his wife multiple times. He used to attack the psychological weaknesses of all the people around him. The females around him craved for his attention, and a lot of people saw him as a god.
However, it wasn't a simpleton average 1900s "Your god is crap, I am better" cult, but an absolutely gruesome cult. Roch was a very psychopathic person. Even as an unlicensed "doctor", he used to perform surgeries to treat shortly occurring illness of his cult members, which often resulted into chronic disorders in them. He used to subject his female followers to all kinds of abuse and violence, and the male followers as well. He used to see himself as the absolute, was a highly narcissistic individual, and highly manipulative.
He manipulated his cult members to the point where they thought that the abuse they were subjected to was normal. He used all kinds of demoralization, fallacies, deception and fabrication to blind them. The females in his cult were so obsessed with him, that even after the abuse, they all still craved his attention, and this was all while he was married for the second time (his first marriage was broke off) and was cheating on his then wife.
Now, he was on a run for many years. Even when he had so many victims, he was never arrested for a long time. His victims never reported it to the police, such was his level of manipulation and charisma.
GORY PART NOW (YOU CAN SKIP IT)
Now, if you want to know the level of abuse, violence, and the injuries caused to them:
1. He was performing surgeries on people on a daily basis. He saw himself as a doctor even when he wasn't one, and he used to recklessly tear through body parts of his members.
2. He beat a person so much that their intestines were shredded to pieces.
3. He cut arms of people and got his own son's genitals cut. He used to break people's legs with hammers by continuously attacking them while they screamed in agony.
4. Once, a female member was beaten so much that her uterus fell out of her genital openings, he punched her uterus back in, of course, this injured her much more.
5. He used to regularly torture people by attacking the sensitive parts of all sorts repeatedly.
6. He was regularly involved in violence where the absolute forms of violence for us were normal there, and the true violence was of extremely high levels.
Even after all of this stuff, he was convicted for a single killing, and all the evidence of his previous victims were cleared. This is similar to the level of Johan, where he was detained when one of his victims spoke up, and when Tenma finally moralized them. Of course, I am not saying this guy compares to Johan (Johan is times better), but only illustrating an example of how killers can escape detectives and police and can never be found out for a large amount of time. This guy was known by the police, even suspicious, but the truth was that he used the fact that there were many cults already and used the fact that he was forming an awareness organization before.