http://www.youtube.com/watch?v=zY5k-GZp10A
From what I understand, the protests were incredibly peaceful - until 3 days ago, when the "Supreme Court" which changed the law to allow convicted felon Lua to become president again - arrested a protest leader, in order to stop the protests.
The arrested protest leader was a native indian, which I guess has special relevance in Brazil. That was when the election protests by MILLIONS became violent.
It sounds like this could turn into a military intervention. And, supposedly, the military favors Bolsonaro. So that could be interesting.