Take down Decker

Take down Decker is an unmarked quest in Fallout.

Detailed walkthrough
After taking one (or both) of Decker's quests (Dispose of Jain and/or Dispose of merchant), the Vault Dweller can choose to report Decker's crimes to the Hub police. Sheriff Justin Greene will offer them this unmarked quest if a Charisma check is passed, promising 300 caps up front, and 1000 caps upon completion of the quest.

The Vault Dweller's party (now including Sheriff Greene and Deputy Fry) fast travels to the basement of the Maltese Falcon to confront Decker and his guards.

Rewards

 * 1300 bottle caps
 * +4 Reputation (+1 additional for killing Kane)
 * 1400 XP