A financial fraud case will likely become Brazil's largest corruption scandal in a decade, fueling institutional friction, financial volatility and political uncertainty ahead of a general election in October. Brazilian banker Daniel Vorcaro, who is under arrest over financial fraud allegations involving the liquidated Banco Master bank, has updated a plea bargain proposal to provide new information about his connections to high-profile politicians. In the new document, presented to authorities on June 1, he included evidence about money transfers requested by right-wing senator and presidential hopeful Flavio Bolsonaro, the eldest son of former President Jair Bolsonaro. Vorcaro said he provided nearly 60 million reais ($12 million) for the production of a movie about Jair Bolsonaro's life. These revelations have taken place as a federal probe into Banco Master has expanded to focus on a potentially vast network of embezzlement and influence peddling allegedly involving two Supreme Court justices, former ministers...