FILE - In this April 9, 2015, file photo, the former Workers' Party's Treasurer Joao Vaccari listens to a question during his testimony to a congressional committee in Brasilia, Brazil. Vaccari was sentenced Monday, Sept. 21, 2015, to over 15 years in prison for his role in a kickback scheme at state-run oil company Petrobras (AP Photo/Cadu Gomes, File)