The United Nations views forced marriage as a form of human rights abuse, since it violates the principle of the freedom and autonomy of individuals. The Universal Declaration of Human Rights states that a person's right to choose a spouse and enter freely into marriage is central to their life and dignity, and their equality as a human being. The Roman Catholic Church deems forced marriage grounds for granting an annulment—for a marriage to be valid both parties must give their consent freely. The Supplementary Convention on the Abolition of Slavery also prohibits marriage without right to refusal by both parties and requires a minimum age for marriage to prevent this.