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 in the Grove Street, don't start killing the drug dealers because that will attract police attention and the gang war may turn difficult. A lot of Ballas will be hanging around the Grove Street and they will shot you, kill 3 Ballas to start a gang war. If a GSF member is high on crack you can not utilize him to fight. You must be heavily armed, the best places to take cover is on the houses roof or in the basketball court, survive the three waves and be careful because the Ballas will come at both sides from the street. Keep attention if sweet is taking damage. After you get back the Grove Street, kill normally the remaining crack dealers. The mission Beat Down on B Dup is unlocked.