FILE - In this Feb. 4, 2015 file photo, workers whose company is contracted by Brazil's government-run oil company Petrobras throw their work uniforms at Petrobras headquarters to protest corruption, in Rio de Janeiro, Brazil. Petrobras was accused by federal prosecutors of the biggest corruption scheme in Brazil’s history in 2014, in allegations that at least $2 billion in bribes were paid out over about a decade. Several top officers resigned and even pulled leading politicians into ongoing investigations. (AP Photo/Silvia Izquierdo, File)