The act of telling people what they can and cant do, according to your own personal viewpoint. This mainly extends to interests, hobbies, things they enjoy. Used most often by social justice bloggers on the website Tumblr, often turning to mass hate on people whose interests do not fall within the strict guidelines of what these bloggers deem acceptable for the masses. There are blogs set up literally so people can anonymously say they enjoy these things without being attacked. Im pretty sure totalitarian governments do exactly the same thing.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Policing"