Former Brazilian Economy Minister Guido Mantega (2-R) is escorted by Federal Police agents, after being arrested in Sao Paulo, Brazil on September 22, 2016. Brazilian police Thursday arrested Guido Mantega, a former finance minister under presidents Lula da Silva and Dilma Rousseff, as part of the investigation into the vast Petrobras corruption scheme, media reported. Mantega, who was an important figure in the leftist Workers' Party, was arrested at a Sao Paulo hospital where his wife had undergone surgery. / AFP PHOTO / Miguel SchincariolMIGUEL SCHINCARIOL/AFP/Getty Images