Riot police officer uses pepper spray against anti-establishment protesters during a demonstration against high security prisons in Athens

A riot police officer (C) uses pepper spray against anti-establishment protesters during a demonstration against high security prisons in Athens April 16, 2015. REUTERS/Alkis Konstantinidis

Anti-establishment protesters clash with riot police during a protest against high security prisons in Athens
Joao Vaccari, treasurer of Brazil's ruling Workers' Party, is escorted by police as he arrives to a legal medical institute in Curitiba