Petrobras and Brazil's Operation Car Wash scandal

Beginning as a routine money-laundering investigation at a Brasília gas station in early 2014, Brazilian police uncovered a vast scheme in which executives at state-controlled oil company Petrobras had colluded with a cartel of major construction firms to inflate contracts, funneling the resulting kickbacks to company insiders and to politicians across Brazil's major parties. The investigation, known as Operation Car Wash (Lava Jato), eventually implicated dozens of senior politicians and business executives, including former president Luiz Inácio Lula da Silva, who was convicted and imprisoned before his conviction was later annulled. Petrobras itself took billions of dollars in write-downs related to the inflated contracts and paid substantial settlements to US and Brazilian regulators over the fraud, while its market value fell sharply as the scale of the scandal became clear. The case became Brazil's largest corruption investigation and reshaped its politics for years, contributing to the impeachment of President Dilma Rousseff in 2016 and the rise of Jair Bolsonaro, though the sprawling prosecution effort was itself later criticized by Brazil's Supreme Court for procedural abuses.