You discover that the Ballas got back into the drug dealing in San Fierro, informed by Woozie, and then you go there and he says that they are splitted in three parts and you have 13 minutes to beat them. After, Woozie's guys discover more 2 Ballas drug dealing spots, and goes there and beat them. Meanwhile, the mafia attacks your casino. After beating the Ballas, Woozie calls you to beat the mafia. After that, Sweet calls you to say that the Ballas want you, and if you don't come in ten minutes, your brother will die. You go, beat them and done :D