Violence erupts in Sao Paulo - Brazil's biggest city - as scores take to the streets in anti-establishment protests.<br/> <br />This was one of several demonstrations held across the country on Friday, dubbed "National Mobilization and Fight Day".<br/> <br />Marchers railed against everything from corruption, to poverty to capitalism.<br/> <br />Some looted a bank and a television station, while others plastered spray paint on buildings.<br/> <br />This protester said marchers are fed up with being oppressed - adding they're willing to use violence to bring about changes in Brazil's social order.<br/> <br />Meanwhile, in Rio de Janeiro, protesters denounced what they called official corruption and government over-spending.<br/> <br />Much of the anger was directed at Brazilian president Dilma Roussef, the subject of fierce protests in recent months.<br/> <br />Critics say her government has wasted money building stadiums for the upcoming Olympics and the World Cup, while ignoring healthcare, education and poverty.