The Ministry of Justice is the lead agency in the justice sector and the lead agency on Crown/Māori Relations for the government. They work towards a safe and just New Zealand. To do this they administer the court system, the legal aid system and the Public Defence Service. They collect and enforce fines and civil debts. They also negotiate the settlement of historical Treaty of Waitangi claims against the Crown and ensure that settlements remain durable. They provide policy advice on matters related to justice and the administration of the law, and on Crown/Māori Relations.