Brazilian prosecutors on Thursday filed charges against 36 suspects in a corruption investigation alleging construction companies bribed public officials and overbilled state-controlled energy giant Petroleo Brasileiro SA Among those charged were 23 executives from six of the biggest construction companies in Brazil: Camargo CorrAaa SA, Engevix, GalvA o Engenharia, Mendes JAonior, OAS and UTC Engenharia SA. Also among them were Paulo Roberto Costa, the former director of Petrobras' refining division, and Alberto Youssef, an alleged black-market currency dealer who is accused of distributing the bribe payments.