STORY: Five things you should know about Luiz Inacio Lula da Silva
1. Lula is a two-time president and former metalworker
2. He led labor union strikes against a military dictatorship and formed the leftist Workers Party in 1980
3. Barack Obama once called him "the most popular politician on Earth"
4. He was jailed in Brazil's biggest corruption scandal, but freed after 19 months
The Supreme Court annulled his convictions
5. He's vowed to undo Jair Bolsonaro's legacy, including pro-gun policies
and weakened environmental protections in the Amazon rainforest