The footage of police fatally assaulting Ian Tomlinson and assaulting people en masse at the G20 has prompted a lot of concern about police attitudes. But the first thing the police did when the Tomlinson footage went online was visit the publisher's offices and demand it be taken down.
Two documentary films showing police repression have been met with similar - far stronger - attempts to stop them being seen. In doing that, the police make clear that if justice challenges their authority then they regard it as an enemy.
I've just published a new article on U-Know about those films and the police campaigns against them, called Nothing To See.