CNN has a map of gang territories, in the Hollenbeck neighborhood of L.A.
Note the vacant gray areas:

Now, what is wrong with these areas? Why haven't one of the 34 gangs taken over these swaths of land?
I hereby lay claim to these gray undeclared lands. Anyone who wishes to join my gang must submit a resume with references (prison time a plus), and be able to come up with a name vastly superior to 'Krazy Ass Mexicans'.
(And I also think that gangs should have websites. For instance, krazyassmexicans.com is an available domain now, but it won't be for long. Someone should be working on this)