For anyone who wants to keep an eye on what's going on, the subreddit /r/PublicFreakout is full of videos of police (and rioters) engaging in violence. I haven't found a better source yet. There's sometimes misattributed content, so be sure to wade carefully. Many of these cases have multiple videos from different people from different angles as well. The evidence is quite damning.
Could you clarify your use of "permitted" here? In the sense of "allowed", it seems redundant, since you go on to say that they were or were not forcibly dispersed.
The other option, more literal, is "they got a permit to do this protest", but there have certainly been plenty of peaceful grassroots protests that got no sort of official go-ahead and yet were executed perfectly fine on both sides.
