It's hard to say for sure, but many would consider Thanos to be one of the biggest villains. His quest for power and his actions in the Infinity Saga had a huge impact.
The Bernardo - Homolka case is at the top. Their crimes were not only brutal but also involved a complex relationship between the two perpetrators. Karla Homolka made a plea bargain which was highly controversial.
Brutus from 'Julius Caesar' is a very notorious betrayer. He was so close to Caesar, seen as a friend, yet he took part in the assassination plot. His actions were driven by his belief that Caesar was becoming too powerful, but his betrayal was still a huge shock. Then there's Iago from 'Othello'. Iago manipulates Othello into believing his wife Desdemona is unfaithful, all out of his own jealousy and spite, which ultimately leads to tragic consequences.
Another notorious story is about the theft of a large amount of precious metals from a refinery. The thieves had to plan carefully as the refinery had security measures in place. They managed to bypass some of the security systems and make off with the valuable metals. The police had to use forensic evidence and witness statements to try and catch the thieves.
Well, without having read it, it could center around a protagonist who is the'most notorious talker'. Maybe this character uses their talking ability to manipulate situations, or it could be a comical take on someone who just can't stop chatting and how that affects the people around them. For example, they might talk their way into or out of difficult situations, or their non - stop talking could be a source of annoyance or charm depending on the other characters' perspectives.
The Whitey Bulger story is very notorious in New England. He was involved in organized crime, including drug trafficking, extortion, and murder. He managed to evade the law for a long time with the help of corrupt law enforcement officers. His story shows the dark side of power and corruption in New England's criminal underworld. There are also some historical crime stories like witch trials in Salem, Massachusetts, which were not exactly traditional crimes but led to a lot of unjust persecutions.
There's also Bellatrix Lestrange from the 'Harry Potter' series. She is a Death Eater and is responsible for multiple murders. Her loyalty to Voldemort and her pure - blood supremacist beliefs drive her to kill without remorse. Her character shows how ideology can play a role in the actions of fictional female serial killers.
There was also a cheat where players could manipulate the fog of war. They could see the entire map all the time, including the movements and positions of all enemy units. This gave them a huge strategic advantage as they could plan their attacks and defenses with full knowledge of what the other side was doing, while their opponents were left in the dark.
It could be the shock factor. If it involves something unexpected like a huge betrayal or a major crime that goes against the norms of society, that would make it notorious.