Government power to take private property for public use without the owner's consent. Constitutional provisions in most countries, including the U.S. (in the 5th Amendment to the Constitution), require the payment of just compensation to the owner. As a power peculiar to sovereign authority and coupled with a duty to pay compensation, the concept was developed by such 17th-century natural-law jurists as Hugo Grotius and Samuel Pufendorf. Seealso confiscation.
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Unlike eminent domain, expropriation takes place beyond the common law legal systems and refers to socially-motivated confiscations of any property rather than to taking away the real estate. No compensation to owners is given. The term appears as "expropriation of expropriators (ruling classes)" in marxist theory, or as slogan "Loot the looters!", very popular during Russian October Revolution
The term often refers to nationalization campaigns by communist states, such as dekulakization and collectivization in the USSR . It may also refer to robberies by revolutionaries to fund their political activities, such as robberies by Joseph Stalin and Kamo in Russian Empire .
The traditional interpretation of Marxism hold that all large-scale industries and private properties should be expropriated and held by the state. Leon Trotsky even absolutely rejected any payment to the private owners. Trotsky was very adamant on the issue of not compensating private owners.
Trotsky has written
Conversely, acts of expropriation may be warranted for a variety of reasons, peculiar to the local governmental entity. Sometimes, for instance, the expropriated business owners pay little or no attention to the host country's assertion that royalty payments are too small relative to the resources being extracted from the host country. Some host country political complaints may relate to the treatment of its nationals as employees of the business. At other times, the host government may judge that strategic decisions about the business entity are simply wrong-headed and ill-advised, as applied to the host country, however right they may seem to the owners. Such judgments may also occur when the business entity fails to include the host country's interests and concerns, legitimate or not, as matters of ordinary consultation and effective participation in the operational plans of the business entity.
As a result of both direct and indirect expropriation, a just compensation must be paid. US Secretary of State Cordell Hull defined just compensation in 1938 as "prompt, adequate and effective."