ATHENS, GREECE – OCTOBER 20: Pro-communist union protesters clash with other demonstrators during a protest against plans for new austerity measures on October 20, 2011 in Athens, Greece. On the second day of a 48-hour general strike against austerity measures being debated today in parliament, police fired tear gas and stun grenades as hundreds of masked youths attacked peaceful demonstrators from a Communist-backed trade union who had tried to isolate them from the rally. (Photo by Milos Bicanski/Getty Images)