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Stepan Lenkavsky, one of the co-founders of the Organisation of the Ukrainian Nationalists, its chief ideologist, author of the Decalogue of the Ukrainian Nationalist, leader of the Foreign Units of the OUN after the assassination of Stepan Bandera, a great and at the same time modest post, which until recently was undeservedly neglected by modern scholars of Ukrainian nationalism.

In the course of 1998–2010. This vacuum was significantly filled – there was published a popular scientific drawing «Stepan Lenkavsky: Life's Path in the History of the OUN», dozens of scientific and pUBLIC articles, a collection of works in three volumes, which have already become a bibliographical rarity.

The renewed revision of Stepan Lenkavsky's works in four volumes is carried out under the conditions of full-fledged introduction of his name and creative treasure into the scientific community. The growing interest in the creative heritage of one of the leading ideologues and activists of the OUN is strengthened by active social tendencies. The Ukrainian state is going through a difficult stage of formation of its national foundations, and Ukrainian nationalism is gaining more and more importance in its political life. At the same time Europe is experiencing a renaissance of nationalism, and in Ukraine the scientific interest in this world-view and political phenomenon is growing together.

Before the first volume of Stepan Lenkavsky's works, his works on the history of Ukrainian nationalism were included. They have a different primary purpose – some of them are purposefully placed in the context of its presentation, others were written in the process of the OUN activity and today they are a source for its study. Many of the materials are internal analyses. They were found in the foreign archives of the OUN and are published for the first time. Chronologically, the works of the first volume will cover the entire historical period of the development of Ukrainian nationalism: the stage of protonationalism, the beginnings of the organised nationalist movement, the prehistory and history of the UUN and its foreign structures.

The book is intended for researchers of Ukrainian history, Ukrainian political science, the history of Ukrainian nationalism and a wide range of supporters of it as an ideology and political movement.