A Brazilian Supreme Court justice on Monday annulled a series of criminal convictions against former President Luiz Inácio Lula da Silva, possibly setting the stage for his political comeback. Justice Edson Fachin set aside graft convictions against the popular 74-year-old former labor leader stemming from the "Carwash" corruption probe, in which Lula da Silva was convicted of bribery and other crimes in connection with the state-run oil company Petrobras. His 12-year prison sentence in April 2018 prevented him from running against right-wing Brazilian President Jair Bolsonaro. Fachin's ruling, however, removed a key obstacle against another run next year. The high...