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The North Atlantic Treaty Organization (NATO, ; French: Organisation du traité de l'Atlantique nord, OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance between 28 European countries and 2 North American countries. The organization implements the North Atlantic Treaty that was signed on 4 April 1949.

NATO constitutes a system of collective security, whereby its independent member states agree to mutual defense in response to an attack by any external party. The NATO headquarters are located in Brussels, Belgium, while the headquarters of Allied Command Operations is near Mons, Belgium.

Since its founding, the admission of new member states has increased the alliance from the original 12 countries to 30. The most recent member state to be added to NATO was North Macedonia on 27 March 2020. NATO currently recognizes Bosnia and Herzegovina, Georgia, and Ukraine as aspiring members. An additional 20 countries participate in NATO's Partnership for Peace programme, with 15 other countries involved in institutionalized dialogue programmes. The combined military spending of all NATO members in 2020 constituted over 57% of the global nominal total. Members agreed that their aim is to reach or maintain the target defence spending of at least 2% of their GDP by 2024.

The International Society for Krishna Consciousness (ISKCON), known colloquially as the Hare Krishna movement or Hare Krishnas, is a Gaudiya Vaishnava religious organisation. ISKCON was founded in 1966 in New York City by A. C. Bhaktivedanta Swami Prabhupada. Its core beliefs are based on Hindu scriptures, particularly the Bhagavad Gita and the Bhagavata Purana, and the Gaudiya Vaishnava tradition, which has had adherents in India since the late 15th century and American and European devotees since the early 1900s.

ISKCON devotees follow a disciplic line of Brahma Madhva Gaudiya Sampradaya and are the largest branch of Gaudiya Vaishnavism. Vaishnavism means 'worship of Vishnu', and Gauḍa refers to the area where this particular branch of Vaishnavism originated, in the Gauda region of West Bengal.

The organization was formed to spread the practice of Bhakti yoga, the practice of love of God in which those involved (bhaktas) dedicate their thoughts and actions towards pleasing Krishna, whom they consider the Supreme Lord. Its most rapid expansions in membership as of 2007 have been within India and especially after the collapse of the Soviet Union, in Russia and the rest of the formerly Soviet-aligned states of Eastern Europe and Central Asia.

Today, it has around a million congregational members worldwide, and despite its relatively small number of followers in the West, it has been described as influential.

The Fellowship of Reconciliation (FoR or FOR) is the name used by a number of religious nonviolent organizations, particularly in English-speaking countries. They are linked by affiliation to the International Fellowship of Reconciliation (IFOR).

In the United Kingdom, the acronym "FoR" is normally typeset with a lower-case "o"; elsewhere, it is usually typeset in all capital letters, as "FOR", such as in "IFOR".

The Organization of the Petroleum Exporting Countries (OPEC, OH-pek) is an intergovernmental organization or cartel of 13 countries. Founded on 14 September 1960 in Baghdad by the first five members (Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela), it has since 1965 been headquartered in Vienna, Austria, although Austria is not an OPEC member state. As of September 2018, the 13 member countries accounted for an estimated 44 percent of global oil production and 81.5 percent of the world's "proven" oil reserves, giving OPEC a major influence on global oil prices that were previously determined by the so-called "Seven Sisters" grouping of multinational oil companies.

The stated mission of the organization is to "coordinate and unify the petroleum policies of its member countries and ensure the stabilization of oil markets, in order to secure an efficient, economic and regular supply of petroleum to consumers, a steady income to producers, and a fair return on capital for those investing in the petroleum industry." Economists often cite OPEC as a textbook example of a cartel that cooperates to reduce market competition, but one whose consultations are protected by the doctrine of state immunity under international law. The organization is also a significant provider of information about the international oil market.

The formation of OPEC marked a turning point toward national sovereignty over natural resources, and OPEC decisions have come to play a prominent role in the global oil market and international relations. The effect can be particularly strong when wars or civil disorders lead to extended interruptions in supply. In the 1970s, restrictions in oil production led to a dramatic rise in oil prices and in the revenue and wealth of OPEC, with long-lasting and far-reaching consequences for the global economy. In the 1980s, OPEC began setting production targets for its member nations; generally, when the targets are reduced, oil prices increase. This has occurred most recently from the organization's 2008 and 2016 decisions to trim oversupply.

The current OPEC members are the following: Algeria, Angola, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, the Republic of the Congo, Saudi Arabia (the de facto leader), the United Arab Emirates and Venezuela. Former OPEC members are Ecuador, Indonesia and Qatar. A larger group called OPEC+ was formed in late 2016 to have more control on the global crude oil market.