After you get the call from Sweet that he is out of jail drive to Commerce drive there and pick him up. He will want to go back to Grove Street in Ganton regardless of what Carl says. After arriving kill the crack dealers to keep the Grove Street Families members in for work. If a gang member is high on crack they will not be able to fight. Kill every Crack Dealer, then shoot some Ballas to start a gang war. The waves will be better armed and due to the high amount of exposed space it is easy to get hit. Once all the Ballas and Crack Dealers are killed then Grove Street will be retaken and the missions Beat Down on B Dup and Cut Throat Business will be unlocked.