You see, the policemen are corrupt almost everywhere in India. Not just in adivasi lands. If you are talking about encounter deaths, then know that in AP, the naxalites have killed many innocent people in the name of eliminating "class enemies". In the early 1990s, a train was set on fire by naxalites near Hyderabd resulting in the deaths of 47 ordinary civilians. Due to this incident and the oppressive parallel government system run by the naxalites, these guys have lost popular support in Andhra Pradesh.