The motorcycle and car club scene in Southern Cal is growing and has globalized in recent years. They are not gangs, but many former gang members have got into them.
If you read the guestbook it normally has entries posted from different chapters and clubs that are allies. White Trash Network has an article in their archives if you go back 3-6 months. The article claims that there are 1,500 members statewide in California but i can't confirm or deny this. As far as enemies the only Vagos story I have ever really heard about is a big rumble they had with the Hell's Angels at a swap meet a few years back. I don't know the cause of the tension and I don't think it ever led to a full blown war between the clubs.