Falcão - Meninos do Tráfico was one of the first books I read in Portuguese, back when it was hard for me to understand the vocabulary, let alone all the slang. The book is based on a documentary made in 2006 by Brazilian rapper MV Bill about children and youth in drug trafficking in Brazil. I'd never actually seen the movie, so I was excited to find it in its entirety on YouTube. It's grim and a bit disjointed, but still very eye-opening for those unfamiliar with drug trafficking and police corruption in Brazil, and a jarring reminder to those who are. It also shows that the drug trade in Brazil extends far beyond Rio's favelas to many major cities in Brazil (though the book provides more detail about the locations). Unfortunately, the videos aren't available in English, although a lot of the dialogue has Portuguese subtitles with occasional explanations of certain slang words.
Falcão: Meninos do Tráfico