Free fall is one of the 100+ missions in San Andreas. It is associated with three main characters. If you have played the game then you know that the San Andreas city is very big and the developers have divided it into many parts. Some of the main parts of city are Los Santos, Country-side, Las Ventura, Los Angeles and Angel Pine.
You play different challenges in the above parts. These three are central characters in the video game. Ken Rosenberg, Salvatore Leone and Carl Johnson are those three central characters.
Ken gives you a task named as 'The Meat business'. After completing this, you get a call from Ken. He invites you to Salvatore's place. Salvatore is one of the wealthy businessmen in GTA San Andreas. And Ken is a lawyer and he works for Leone.