https://en.wikipedia.org/wiki/Lucona

Which lead me to:

https://en.wikipedia.org/wiki/Operation_Gladio

"According to several Western European researchers, the operation involved the use of assassination, psychological warfare, and false flag operations to delegitimize left-wing parties in Western European countries, and even went so far as to support anti-communist militias and right-wing terrorism as they tortured communists and assassinated them"

Opened a whole box of pandora for me. So I rather think there is much more dark shit going on, than what makes the news, we just see the tip of the iceberg. And not just about the big players. Probably also common people have way more corpses in their basements, than what you would expect, if you grew up in a safe space.

Edit: about Lucona, the wiki page reads quite boring, but the book by the private detective who uncovered it, is quite informative. Casual mentioned details, like that there is a court of the organized crime in london where they settle their cases. Or that the insurance company, who initially hired him to investigate, offered him money in the end, to stop investigating, as he was uncovering up too much dirt.