Brazilian Senator Flavio Bolsonaro, the leading right-wing challenger to President Luiz Inacio Lula da Silva in next month’s election, is under investigation for alleged corruption and money laundering tied to failed lender Banco Master, according to court documents unsealed on Friday. The probe into the senator, the eldest son of former President Jair Bolsonaro, was opened in July by Supreme Court Justice Andre Mendonca, a Bolsonaro appointee who has recently been hailed as a hero by many on...