[X] There are independent heroes desperately fighting to resist the rule of the cartels in their own nations across South and Central America. You can try to clandestinely bring them over, giving them a home in Brazil, where they'll help you fight the Brazilian cartels in exchange for future assistance with their own homelands.
By thy own hand be free. Also, force concentration.
[x] Belo Horizonte still had a police force while under supervillain rule - but its members were cops willing to answer to work for the cartel. While it's logistically tempting to keep them around, a thoroughly corrupt police force can actually be worse than no police at all. It's best to have all these people suspended, and have people you trust handle recruitment for the new Belo Horizonte police department, checking the personal credentials of each individual recruit and preexisting cop.
[ ] The elites of Belo Horizonte - both the actual parahumans and the business leaders who collaborated with them - weren't exactly shy about hoarding wealth. Now is a good time to have most of it seized and redistributed to the less wealthy in the region. After all, the people need to see that the government is actually preferable to cartel rule, and future triggers will be more likely to side with the law.
Both of these are temping though. Cleaning the police force out will cut off the cartel's information streams AND remove people abusing the population.
Wealth redistribution is directly making things better and proving that the government is for the people, but seems premature? I feel focusing on options that win today more cleanly is the play.