Demonstrators hold up pig heads as riot policemen stand guard during a rally in downtown Santiago November 4, 2009. Chilean teachers and public sector workers marched through streets as they protested for a bonus which they believe is owed to them by the government and to demand for an increase in their salaries. The sign reads "A Velasco" in reference to Andres Velasco, Chile's Finance Minister. REUTERS/Victor Ruiz Caballero (CHILE CONFLICT POLITICS EDUCATION)
REUTERS/VICTOR RUIZ CABALLERO