In Greece, a nationwide strike was held Thursday to protest new austerity measures announced to tackle the Greek debt crisis. Clashes erupted after more than 10,000 people marched through Athens to denounce a series of spending cuts and tax increases. Federal regulators are currently probing major Wall Street firms for their role in Greece’s financial collapse. Goldman Sachs is said to be the most important of more than a dozen banks used by the Greek government to manage its national debt using derivatives.