"Qu'on me donne six lignes écrites de la main du plus honnête homme, j'y trouverai de quoi le faire pendre." (If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him.) [1] Attributed to Cardinal Richelieu though authenticity is disputed.

Anyway, dystopian films containing mass surveillance (such as Fahrenheit 451) also cover the very same practice.

[1] https://en.wikiquote.org/wiki/Cardinal_Richelieu