VM is the traditional red-light district in Rio de Janiero. For decades, locals have gone to the VM district, on the north side of town, to find enjoyment. Few tourist go into VM as the location is near a large favela (ghetto).
However, apparently there is little to no crime or violence inside the VM district, itself, because security is swift to take care of troublemakers. That said, getting to the VM area is not easy to discern and a wrong turn could send one walking into the favela!
Here is a Brazilian news documentary from 1989 that portrays VM as a diverse, working class neighborhood. Fairly interesting: