Protesters take part during a march, where leftist organizations demonstrated their opposition to new taxes on food and medicine, as well as the privatization of state oil company Pemex, in Mexico City March 18, 2013. Protesters from civil organizations and workers from various unions are seeking to pressure the government to reject any would-be proposal to apply the country's I.V.A. (value added tax) to food and medicine or privatize Pemex, according to local media. REUTERS/Henry Romero (MEXICO - Tags: POLITICS BUSINESS ENERGY CIVIL UNREST)