This protest was orchestrated by a group of the extreme Left, known as Rifondazione Partito Communista. They are known to congregate at the Piazza Sanniti, in the section of Rome, knows as San Lorenzo. They are extreme anti-clericals, atheits and Marxists. They are not part of the ruling government coalition in Italy. They attempted to march down the streets after this, but were blocked by the Police. However the government was so afraid that for nearly 2 hours, they had patrol helicopters circling in the air to monitor the situation.
The chant that they can be heard to be reciting, “Pagherete caro pagherete tutto”, (You will pay dearly, you will all pay) is the 40 year old chant of the Communist party against Confindustria, the Italian Corporate Employers Federation.
Their protest had been announced by GoNews.It two days ago. Read more in Italian here.