Supporters of jailed former President Luiz Inacio Lula da Silva, celebrate a Supreme Court decision that may free Da Silva, outside Brazil's Supreme Court, in Brasilia, Brazil, Thursday, Nov. 7, 2019. Brazil's top court has reached a narrow decision that could release almost 5,000 inmates that are still appealing their convictions, including Da Silva. The country's Supreme Court decided by 6 votes to 5 on Thursday that a person can only be jailed after all appeals to high courts have been exhausted. (AP Photo/Eraldo Peres)

Supporters of jailed former President Luiz Inacio Lula da Silva, celebrate a Supreme Court decision that may free Da Silva, outside Brazil's Supreme Court, in Brasilia, Brazil, Thursday, Nov. 7, 2019. Brazil's top court has reached a narrow decision that could release almost 5,000 inmates that are still appealing their convictions, including Da Silva. The country's Supreme Court decided by 6 votes to 5 on Thursday that a person can only be jailed after all appeals to high courts have been exhausted. (AP Photo/Eraldo Peres)

SAO PAULO (AP) — Brazil’s Supreme Court delivered a narrow decision Thursday night that could release almost 5,000 inmates still appealing their convictions, including jailed former President Luiz Inácio Lula da Silva.

The court decided in a 6-5 vote that a person can be imprisoned only after all appeals to higher courts have been exhausted.

The decision appears to cover Da Silva and others convicted in cases arising from the sprawling “Car Wash” corruption investigation, which has ensnared dozens of top politicians and business leaders in Latin America’s biggest nation.

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The former president’s attorneys said in a statement they will request his release Friday. That move will initially depend on a judge based in the southern city of Curitiba, where Da Silva is jailed.

The Supreme Court’s debate began in mid-October and its result could throw Brazil’s political landscape into uncertainty. Da Silva had been favored to win the 2018 presidential election, but his conviction prohibited him from running. He remains a popular figure on the left, whose politicians and voters have ceaselessly called for his release and celebrated Thursday’s ruling.

Prosecutors from the Car Wash probe said in a statement that the decision “goes against the sentiment of repudiating impunity and the fight against corruption.”

Many powerful Brazilians imprisoned in the investigation will now be able to seek release.

The decision marks a sharp change for Brazil’s top court, which in February 2016 accepted that defendants whose convictions are upheld may be jailed even if their other appeals are pending. Brazil’s constitution states that no one can be considered guilty until due process is concluded.

“I’m not surprised, politicians rarely stay very long in jail,” said Rivaldo Santos, a 43-year-old waiter in Sao Paulo. Da Silva “spent some time, which is a change, but not nearly as much as other people that committed crimes but didn’t have judges and lawyers on their side.”

Da Silva, universally known to Brazilians as Lula, presided over a period of rapid economic growth from 2003 to 2010 fueled by a commodities boom that expanded the country’s middle class. His huge Bolsa Familia welfare program helped lift millions from poverty, and he left office with an approval rating above 80%. The former union leader is widely referred to as a “political animal” whose impassioned oratory can just as easily elicit laughter or tears from those among his supporters.

Justice Gilmar Mendes, who voted for the release of inmates who have yet to conclude their appeals, said Da Silva’s case “contaminated” debate on the case.

“That was not good at all for rational debate,” Mendes, an open critic of the Car Wash probe, said during the full court session.

Da Silva’s hand-picked successor, Dilma Rousseff, was impeached and removed from office in 2016. Then Da Silva was jailed in April 2018 after a group of judges upheld his conviction for corruption and money laundering. That left his leftist Workers’ Party rudderless, and it was further demoralized when routed in the 2018 general elections.

Da Silva is still appealing a case related to the alleged purchase of a beachfront apartment in the city of Guaruja, in the state of Sao Paulo. He was also sentenced by a lower court judge in a case regarding alleged ownership of a farmhouse in the city of Atibaia, outside Sao Paulo.

The 74-year-old politician has denied any wrongdoing in those cases. He accuses then judge Sergio Moro and Car Wash prosecutors of political persecution.

Left-leaning supporters hailed the decision that could free their standard-bearer, but want more. They hope Da Silva’s sentence is annulled later this month in another Supreme Court debate over whether Moro was unbiased when he delivered his rulings. Meantime, his conviction continues to bar him from running for office.

“Lula is not electable, but that is not needed for him to take center stage,” political analyst Alberto Almeida said by phone. “He can draw more politicians from the center and end up as a dealmaker for his party’s candidate in the 2022 presidential elections.”

Right-leaning Brazilians have used social media in recent weeks to attack justices who cast votes that could allow Da Silva to walk out of his cell. A protest previously scheduled for this weekend is aimed at showing support for Moro, now serving as President Jair Bolsonaro’s justice minister, and his crusade to root out corruption.

Attacks on the Supreme Court’s ruling will doubtless feature loudly, with the prospect of Da Silva’s release already looming.

“I will pick you up tomorrow! Wait for me,” Da Silva’s girlfriend wrote on Twitter.

In addition to the former president, at least 4,895 prisoners stand to benefit from the decision, Brazil’s justice council estimates.

Most analysts say the decision will not benefit violent criminals such as rapists and murderers. Justice Alexandre de Moraes said those convicts will remain behind bars because judges already issued preventive detentions in their cases, meaning a sentence is not required to jail them.

Brazil’s national association of public prosecutors, though, insists the release of dangerous criminals is a possibility under Thursday’s decision.

“I ask God for there to be peace on the streets and protection of our democracy,” Antônio Costa, head of nonprofit organization Rio de Paz, wrote on Twitter.