https://www.lastampa.it/torino/2019...arrestati-12-capi-ultra-della-juve-1.37469911
https://video.lastampa.it/torino/indagine-last-banner-ecco-come-gli-ultra-bianconeri-mettevano-in-atto-la-loro-strategia-estorsiva/103719/103735
damn, that's more disgusting than i imagined. let's wait and see which part of this story is confirmed.
i'm not able to translate it all, but from these articles by la stampa, i understand that the ultras started to threaten the club after the curva was closed for a match after they racially abused koulibaly last year. they blackmailed the company with using upside down banners, chanting abusive, ban worthy chants, causing damage both inside and outside the stadium, and they even threatened with attacking non-organized juventus fans.
their requests were 25 free tickets per groups per matches, free tickets for those who prepare the banners ("striscionisti", i'm not 100% sure of the meaning), easier access to tickets, invitations to official events organized by the club, etc.