Bounty

Bounties can be obtained in Fallout 3 if you have one of the following perks:
 * Contract Killer (rewards killing of "good" NPCs)
 * Lawbringer (rewards killing of "evil" NPCs)
 * Bounty Killer
 * Bounty Notice: Junders Plunkett
 * Bounty hunter
 * Bounty hunter duster
 * Bounty notice
 * Three-Card Bounty
 * Survivalist's Bounty
 * Do Bob's bounty hunter jobs
 * Motor-Runner Bounty