The Puerto Rican Connection
Is the third and final mission given to you by Manny. In the cutscene Manny is watching the video of him and says it doesn't make him look street. He then asks Niko to kill some of his old buddies who made fun of him. So Niko goes to the train station and waits for it. He then chases after it until he makes it to the next stop. There he kills the 3 pucks and calls Manny telling him he did his job.