Category:Wikipedia's Censorship

1. Sensitive content is summarily removed from the page with minimal explanation
2. The page history reveals persistant efforts to remove a valid point of view
3. The page was deleted from Wikipedia (often applies to individual dissidents who are blacklisted by commercially-controlled media, with a spurious claim of 'non-notifiability')

The best way to detect censorship is to try to add the censored content back into Wikipedia yourself and see what happens...