Attackers of Cinema America group are from right-wing circles.
Rome police have arrested three men for the 16 June assault on four volunteers from Cinema America, the Trastevere-based collective of young people which organises free outdoor movie screenings in the capital.
The three responsible for the attack, all under house arrest, are members of far-right groups.
The attack, which took place in Trastevere late at night, broke out after the aggressors identified the Cinema America volunteers by their "anti-fascist" t-shirts. One of those attacked had his nose broken, another received several stitches for a facial wound.
Following the assault, major Hollywood names including Francis Ford Coppola, Keanu Reeves, Willem Dafoe, Spike Lee, Jeremy Irons and John Malkovich came out in support of Cinema America, stating: "It is unacceptable that there are still those who think they can impose their thoughts with the use of violence."
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Three arrested for Cinema America attack in Rome
Piazza di S. Cosimato, 30, 00153 Roma RM, Italy