Chronic human rights problems plague Brazil, including unlawful police killings and torture and ill-treatment of detainees. Many Brazilian prisons and jails are severely overcrowded, and the lack of adequate state control within the prison grounds leaves inmates vulnerable to violence and recruitment by gangs. Other human rights problems include degrading and abusive working conditions, violence against rural activists and indigenous people involved in conflicts over land, and killings of journalists and bloggers because of their work. Perpetrators of abuses during the military rule of 1964 to 1985 continue to be shielded from justice by an amnesty law passed by the military regime.