Looking for a novel that has Mafia, gangs, special abilities...maybe sth like Bungou stray dogs, If possible.
K side stories K seven stories K four seasons https://www.novelupdates.com/group/chilly-territory/ Durararararararararararararararararararara
not a novel but the manga/anime hunterXhunter might be what you are looking for at least for a lot of the more advanced arcs...
K series Darker than black Triage(?) Gangsta Well these are the ones I know that are mafia and also having special abilities hope it helps
People seem to have forgotten the classic best recommendation, but obviously Baccano. And in second place would be Durarara.
For manga sun-ken rock and korean manhwa high school. For stories.... I was reborn as mafia boss on RRL.
There was a story I read on Royalroad called Mafia God by saleban1(don't know if that's correct). It stopped updating after 37 chapters.