Answer 1: No, they were invented from the imaginations of teenage girl writers on Wattpad and Episode to be gangs full of conveniently single, attractive, shallow 20-something white male supermodels with terrible personalities who kidnap and fall in love with bland self-insert female protagonists.
Answer 2: Yes, they are real and they exist in Italy. Watch The Godfather. They also generally consist of amoral, middle-aged men with wives, children, average looks, and lots of guns. In short, they are real criminals who run shady businesses and kill people.
Answer 1 is a joke, by the way. Please don’t take it seriously. Answer 2 is also not entirely serious, but yes, the mafia was/has been/is real and has killed people.