You can trick Ballas into giving Grove Street to the Aztecas — without ever fighting them yourself.

Type 3 of the Territory Glitch lets players manipulate gang attacks by luring Ballas into Varrios Los Aztecas turf (El Corona/Little Mexico) during a GSF attack, which causes the Aztecas to spawn and attack Grove Street territory instead. With careful manipulation, you can even add Aztecas to normally GSF-only areas by killing Ballas or Vagos there during an active attack.

Source: Territory Glitch — CC BY-SA