The article is devoted to delimitation of nationalization and concepts related to it, namely expropriation, requisition, confiscation, alienation of real estate objects for the reason of social necessity. For this purpose, author identifies competent entity, object of alienation and type of decision in each of specified actions. In article was proven that nationalization is a policy tool and it should be provided by act of legislative body that runs the economic policy. Expropriation can be defined as international concept rather than economic. The related notions were examined as well. Finally, ways for improving the legal regulation were also proposed. The paper is prepared with the complex tools of tax law, criminal law, customs law, sea...