An old italian movie where one man beats another ina fountain

Hello,

I remember watching a film (I think is an italian movie, maybe a 70s or 80s movie; it was in color), where one guy beats another in a square in an Italian city (maybe Rome). After one man is beaten (with blood in his face and in the floor), the other (which is thin with dark and long hair) still wants to hit him, so people (or the police) separates them.

 

Thanks

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