Fight the Power
From wiki
Fight the Power is a quest given by Oscar when you become friends with him. The Quest will begin by Oscar complaining a supposed vandal in Staxel, and how he believes Maximilian is not doing enough to stop them, or even is the supposed vandal.
Walkthrough
First Step:
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Oscar wants the player to go to Aliza to ask about signboards for his campaign. Aliza will give you the recipe for Oscar Campaign Signs.
Second Step: