The San Francsico Faction

Summary
The San Franciso Faction is less of a faction and more of a breeding ground for Raiders, Looters, etc.

The Rot
The Rot was a disease formed in San Francisco and completely decimated the city. Everybody within the city limits has the Rot and because of that the bay area is often left alone. Most raiders who try to leave the city simply don't get very far and die on their way leaving the city because of how deadly the Rot is.

The Destruction of San Francisco
During the Ambassador, it's revealed that Rubio Hernandez had plans to completely decimate and kill everyone in all of San Francsico as to avoid the Rot and prevent it from spreading to other factions, but he was killed by Ejido Navarez before the plans could go through. Only Ejido, Napoleon, and Rubio knew about this plan.