The makeshift tent camp was set up last year by supporters of opposition leader Mikheil Saakashvili after he was stripped of his Ukrainian citizenship.
Saakashvili, a former Georgian president, was deported to Poland last month.
The majority of Saakashvili's supporters left the camp after his departure, but some activists remained.
Police said about 100 activists had been detained due to violence, while six protesters and four police officers were hurt in the clashes
