In some areas, current and former members of the police have formed vigilante gangs. These gangs say they are protecting people but are widely thought to be dangerous criminal gangs. They chase out or kill local drug dealers. They then use protection rackets and tax local businesses of all kinds. Rio de Janeiro "militias" have been responsible for murders of journalists and a judge. Areas under "militia" control tend to see a drop in murder rates but a rise in other forms of violent crime.