In this book, we talked about those public organizations that can attract the attention of most readers due to their popularity or historical significance. You will learn everything about the army and police, intelligence and terrorist groups... People's lives cannot happen without the formation of certain structures and organs. First of all, these are the authorities that appear along with human society. The crown of the ancient authorities can be considered the Areopagus in Ancient Greece and the Senate in Rome. The first articles in the book are about them. Society is developing, requiring appropriate authorities, we talk about the Estates General of medieval France, the US Congress, the developing association of our time - the European Union... Non-governmental organizations have a huge influence on the existence and regulation of people's lives. A public organization is a non-governmental voluntary association of citizens based on common interests and goals. These are the parties and social movements, for example, in Russia in the 19th century: Northern and Southern Secret Societies, Land and Freedom, RSDLP. A special place is occupied by international public organizations - associations whose members are subjects from different countries. The book devotes several articles to such organizations: the UN, the Red Cross, the IAEA, NATO, the Warsaw Pact...