Quell the Uprising
Kill 10 Defias Prisoners, 8 Defias Convicts and 8 Defias Insurgents.
Kill 10 Defias Prisoners, 8 Defias Convicts and 8 Defias Insurgents.

You will finish this naturally while clearing the wings for the bounty quests.
Alliance: Warden Thelwater in Stormwind City (51.5, 69.3).
Alliance: Warden Thelwater in Stormwind City (51.5, 69.5).
experience only, 5,550 XP.
Quell the Uprising is a level 26 quest; you can pick it up from level 22. It takes you into Stormwind Stockades.
All Stormwind Stockades quests on one map ·Stormwind Stockades dungeon guide
Sources: Quest data from ForeverDB.net · ForeverDB: Stormwind Stockade · ForeverDB: Bazil Thredd · ForeverDB: The Dark Iron War · Warcraft Wiki: Stormwind Stockade (Classic)