The LA family was disbanded in the 1980s due the fact that there are no italian communities in LA.
i'm sure that's had nothing do with it. I know places were Mafia cell exist with not more than 50 Italians. Well in California live 1,500,000 so more than enough. OC don't need closed neighborhood or areas. So i don't know why LCN not exist anymore. Los Angels always had a different underworld.
Maybe it had do with Sociocultural /Suburban phenomenons.
But another problem what we really know about organzed crime in LA ? In fact not much.