Fallout: New Vegas/Factions

Factions

 * New California Republic (NCR)
 * Powder Gangers
 * Great Khans
 * Cesares Legion

Lesser Factions

 * Brotherhood of Steel (Veronica Santangelo)
 * Fiends
 * Jackal Gang

Encountering New Factions
When you first encounter a new faction they won't be hostile to you, only because you didn't do anything they don't like around them (Killing, pickpocketing etc.) You can get quests from lesser factions with a followers name next to it, when you have that follower with you. The other lesser factions will just attack you on sight.

See the next page for follower info