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In page Raphael Lemkin:

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In 1933 Lemkin made a presentation to the Legal Council of the League of Nations conference on international criminal law in Madrid, for which he prepared an essay on the Crime of Barbarity as a crime against international law. In 1934 Lemkin, under pressure from the Polish Foreign Minister for comments made at the Madrid conference, resigned his position and became a private solicitor in Warsaw. While in Warsaw, Lemkin attended numerous lectures organized by the Free Polish University, including the classes of Emil Stanisław Rappaport and Wacław Makowski.[citation needed]