What is the largest criminal organization (gang, mafia, etc.) in your country? What are the influences of this group on society in your country? Do they influence the economy, political decisions or some other area, such as private companies? How do people look at this group?

I'm used to hearing about these types of groups on my continent (the Americas), but I've never heard much about them in Europe, other than a few things about these groups in Italy or Eastern Europe.