Brazilian prosecutors on Friday charged two former executives of oil trader Trafigura over allegations of paying at least US$ 1.5 million in bribes to employees of Petrobras. Prosecutors said in a statement that the charges against Mariano Marcondes Ferraz, a former Trafigura top executive, and Marcio Pinto Magalhaes, a country representative, were the first of many to come against the world’s largest oil traders.