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While the Nazis were in power, they plundered cultural property from Germany and from every territory they occupied, targeting Jewish property in particular. This was conducted in a systematic manner with organizations specifically created to determine which public and private collections were most valuable to the Nazi Regime. Some of the objects were earmarked for Hitler's never realized Führermuseum, some objects went to other high-ranking officials such as Hermann Göring, while other objects were traded to fund Nazi activities.
In 1940, an organization known as the  (Reichsleiter Rosenberg Institute for the Occupied Territories), or ERR, was formed, headed for Alfred Rosenberg by Gerhard Utikal​（德语）. The first operating unit, the western branch for France, Belgium, and the Netherlands, called the  (Western Agency), was located in Paris. The chief of this Dienststelle was Kurt von Behr. Its original purpose was to collect Jewish and Freemasonic books and documents, either for destruction or for removal to Germany for further "study". However, late in 1940, Hermann Göring, who in fact controlled the ERR, issued an order that effectively changed the mission of the ERR, mandating it to seize "Jewish" art collections and other objects. The war loot had to be collected in a central place in Paris, the Museum Jeu de Paume. At this collection point worked art historians and other personnel who inventoried the loot before sending it to Germany. Göring also commanded that the loot would first be divided between Hitler and himself. Hitler later ordered that all confiscated works of art were to be made directly available to him. From the end of 1940 to the end of 1942, Göring traveled 20 times to Paris. In the Museum Jeu de Paume, art dealer Bruno Lohse staged 20 expositions of the newly looted art objects, especially for Göring, from which Göring selected at least 594 pieces for his own collection. Göring made Lohse his liaison-officer and installed him in the ERR in March 1941 as the deputy leader of this unit. Items which Hitler and Göring did not want were made available to other Nazi leaders. Under Rosenberg and Göring's leadership, the ERR seized 21,903 art objects from German-occupied countries.
Other Nazi looting organizations included the Sonderauftrag Linz​（德语）, the organization run by the art historian Hans Posse, which was particularly in charge of assembling the works for the Führermuseum, the Dienststelle Mühlmann, operated by Kajetan Mühlmann which operated primarily in the Netherlands and in Belgium, and a Sonderkommando Kuensberg connected to the minister of foreign affairs Joachim von Ribbentrop, which operated first in France, then in Russia and North Africa. In Western Europe, with the advancing German troops, were elements of the "von Ribbentrop Battalion", named after Joachim von Ribbentrop. These men were responsible for entering private and institutional libraries in the occupied countries and removing any materials of interest to the Germans, especially items of scientific, technical, or other informational value.
Art collections from prominent Jewish families, including the Rothschilds, the Rosenbergs, the Wildensteins, and the Schloss Family, were the targets of confiscations because of their significant value. Also, Jewish art dealers sold art to German organizations—often under duress, e.g., the art dealerships of Jacques Goudstikker, Benjamin and Nathan Katz, and Kurt Walter Bachstitz. Also, non-Jewish art dealers sold art to the Germans, e.g., the art dealers De Boer and Hoogendijk in the Netherlands.
By the end of the war, the Third Reich amassed hundreds of thousands of cultural objects.