Oxfam activists wear masks depicting Indian Prime Minister Manmohan Singh, left, Chinese President Hu Jintao, center, and French President Francois Hollande as they protest in Mexico City. AP

Oxfam activists wear masks depicting German Chancellor Angela Merkel, center, and Brazil's President Dilma Rousseff. The activists demand a halt to tax evasion in order to end world hunger and poverty. AP

An Oxfam activist wearing a mask depicting President Barack Obama holds balloons decorated with dollar signs and food during a protest in Mexico. AP

Oxfam activists wear masks depicting Mexico's President Felipe Calderon, left, and Brazil’s President Dilma Rousseff. AP

Oxfam activists wear masks of world leaders as they protest at the Revolution monument in Mexico City. The activists demand a halt to tax evasion in order to end world hunger and poverty. AP