Weren't there some actions around the Olympics (or was it the World Cup) when sites had to be built over a slaves cemetery or something like that, I think I read a couple articles back then
One site, "A Vila Da Mídia" (the media village), an apartment complex for journalists who covered the olympics, built over a old quilombo slave graveyard. The area is for environmental preservation also...
Despite the protests, the corrupt mayor eventually licensed the land to a construction company, this segment is highly profitable and corrupt here.