Hello – I've seen a lot of interesting propaganda and publicity tropes, and would like to develop names and pages for them. There are some really good ones, and they often have narrative arcs over time. Is that in scope here?
Topic on Forum:Wiki Talk
Category:Mind Manipulation Tropes might be a good place to start. Category:Help! Help! This Index Is Being Repressed! is also one for general authoritarianism. There are probably other categories as well that would fit. I don't see any reason why they shouldn't.
More of a genre, IMO, since it appears as different sorts of media - posters, slogans, PSA, etc.
Publicity would overlap with Advertising Tropes. You might want to check there to see if there's anything you were thinking of already written. Once you do start coming up with stuff, I suspect there will be a fair number of tropes that will end up in both Advertising Tropes and Publicity Tropes.