Clashes between protesters and police left around 135 injured including 105 officers while damage to public property was estimated at around one million euros.
Interior Minister Roberto Maroni condemned the "unprecedented violence" and thanked law enforcement for ensuring there were no fatalities.
The weekend clashes were the worst in Rome since the violent and sometimes deadly confrontations pitting political militants from both the far left and the far right against security forces during a period known as the "Years of Lead" in the 1970s and 1980s.
The protests were inspired by the ‘Occupy Wall Street’ movement in the United States and the ‘Indignants’ in Spain, targeting 951 cities in 82 countries across the planet in Asia, Europe, Africa and the Americas.
Protests were also staged in Amsterdam, Athens, Brussels, Geneva, Paris, Sarajevo and Zurich. Thousands also rallied across Canada and in New York and Washington, where they protested outside the White House and the US Treasury.