Freedom of association is the right to join or leave groups of a person's own choosing, and for the group to take collective action to pursue the interests of members. It is both an individual right and a collective right, guaranteed by all modern and democratic legal systems, including the United States Bill of Rights, article 11 of the European Convention on Human Rights and the Canadian Charter of Rights and Freedoms, and international law, including articles 20 and 23 of the Universal Declaration of Human Rights, and Conventions 87 and 98 of the International Labor Organization.