Don't know about Cali. My experience with gangs was all in Chicago. The neighborhood I grew up in was ruled by the Satan's Disciples, not to be confused with the "Devil's Disciples", which was a large black gang.
This is a pretty foreign concept to western US people, but in Chicago, Mexicans and Wedos actually got along pretty well, at least in my day. Almost all of my friends growing up were Mexicans. I was one of them, basically. I played soccer in Douglas Park with my neighborhood buddies, almost all of them Mexican. It was a poor, immigrant neighborhood. In Cali, it seems there is a lot of animosity between Mexicans and whites.
I think the gang structures, even in Chicago, have separated along ethnic lines now days, though.