From WikiGTA - The Complete Grand Theft Auto Walkthrough
Random character: Badman
|Starts at||Little Jacob's house|
|Given by||Little Jacob|
You are now a Friend of Little Jacob
Little Jacob tells you a drug dealer is dealing weed in South Bohan, where he is not supposed to be dealing. Jacob asks you to track him down, follow him to his supplier and to take them down. So drive to the dealer in South Bohan. Once you get there you will see him make his last deal, after which he will call his supplier to tell him he is coming over for new drugs. Use this opportunity and follow the dealer on foot. Keep a save distance and just follow him. If you do not start running, nothing will happen. When the dealer enters an apartment you just follow him. Do not take the stairs, but walk to the door on the other side. Climb over a fence and keep following him. He will pass a brick wall and then turn left into an apartment. Follow him into the apartment. This time you have to take the stairs. Once you are on the fifth floor you will find a pistol. Take it and go into the left hallway. The dealers are in the second room. Quietly go there. The dealers will take cover and open fire upon you. Take cover by the post. Shoot the dealer and his two suppliers to complete the mission.
When you have a grenade it is very easy to kill the two dealers who have taken cover in the small kitchen opposite of the door. The last dealer can be killed easily by entering the room with a pump shotgun.