Free speech in a public venue, such as the streets is constitutionally protected.
Gee, that really looks like the exercising of 'free speech'.
There have been little infringement on the free speech of marchers and protestors. As a matter of fact, the police and business owners have gone out of their way to allow free speech in Miami.
When the anarchists threatened publicly to break windows and destroy business properties, the local business owners closed their shops and businesses in downtown Miami, boarded up their glass doors and windows, and let the protestors have the streets since last Saturday.
The anarchists have publicly taunted the police with threats of violence, some violent demonstrators have broken into for-sale houses to set up training camps and drug parties, and several protestors have been caught with dangerous illegal weapons.
Nevertheless, the cops have not overreacted. They have continued to protect these punks from themselves.
Within limits for public safety.
Free speech in a public venue to redress grievances with the government is, so long as it doesn't obstruct the free movement of others, nor interfere with the free association of others, nor tresspass on other people's property, nor damage the property of others, nor injure others, nor disturb the peace of others. I think we learned in Seattle that these demonstrations go way beyond speech.