"Dura lex sed lex", said the ancient Romans. The law is harsh, but it's the law. This week is rife with tales of former presidents brought to justice. The charismatic former Brazilian president Lula was sentenced to over 12 years in jail - a decision that has polarized Brazilian society. South Africa's former leader, Jacob Zuma, is also facing corruption charges. Also on the programme, the legacy of Winnie Mandela and Trump's isolationist policies. Produced by Daniel BARNEY, Tatiana REITER and Florence VIALA.