Yes, a Brazilian Portuguese dubbed version exists. It was distributed on VHS, DVD, and has aired on Brazilian TV (like Globo or SBT) and streaming services. The dubbing was likely done in São Paulo or Rio de Janeiro.
It seems you're asking about the movie ( Mississippi Burning ) with Brazilian Portuguese dubbing ("dublado"). Mississipi Em Chamas Dublado
If you meant something else by "piece" (a review, a script excerpt, or a film analysis), please clarify. I can provide a synopsis, themes, or historical context for the movie as well. Yes, a Brazilian Portuguese dubbed version exists