In many games I GM, corruption plays a big role. Either in my fantasy games with a church with a firm hand on the king or dystopian future like Shadowrun. Almost every time in my games, corruption is obvious and you can easily spot it. Mostly because I'm not sure how to drop clues of a corrupted system without being too obvious about it. I'm looking for symptoms of a corrupted society and how to include them in my game without necessarily involving the characters directly.
For instance, I already got them arrested after they publicly mentioned their disdain for the Pope. I'm looking at different approaches. Maybe a way to get NPC or the news carry the message. I'm just not sure what would be an effective way of doing so.
I'm looking for techniques that can be effective in any settings or examples that can apply in both modern and fantasy settings.