Pittsburgh is beefing up security with thousands of extra police, as anti-globalization, anti-war, anti-government and anti-poverty activists descend on it for the G20 summit.
Ravenstahl has said protesters will be allowed to exercise their constitutional freedom of speech and assembly "within sight and sound" of the summit venue.
It turns out this will be in a strictly delineated area outside of the downtown cultural area where the likes of US President Barack Obama and China's Hu Jintao will be sitting down with other world leaders.
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