Explanation:

Amnesty International is an international nongovernmental organization which defines its mission as "to undertake research and action focused on preventing and ending abuses of the rights to physical and mental integrity, freedom of conscience and expression, and freedom from discrimination, within the context of its work to promote all human rights. It was founded in London in July 1961 by English labor lawyer, Peter Benenson.
The Commonwealth of Independent States is the international organization, or alliance, consisting of eleven former Soviet Republics: Armenia, Azerbaijan, Belarus, Georgia, Kazakhstan, Kyrgyzstan, Moldova, Russia, Tajikistan, Ukraine, and Uzbekistan. Turkmenistan discontinued permanent membership as of August 26, 2005, and is now an associate member.
The Convention regarding the Regime of Navigation on the Danube signed in Belgrade on 18 August 1948 is the international legal instrument governing navigation on the Danube. The so-called Belgrade Convention is providing for free navigation on the Danube in accordance with the interests and sovereign rights of the Contracting Parties of the Convention aiming thereby at strengthening the economic and cultural relations among themselves and with other nations.
The European Space Agency (ESA), established in 1975, is an intergovernmental organisation dedicated to the exploration of space, currently with 17 member states. Headquartered in Paris.