Vierteljahrshefte für Zeitgeschichte (in German). Iron Kingdom: The Rise and Downfall of Prussia. The goal was to build a classless society based on racial purity and the perceived need to prepare for warfare, conquest and a struggle against Marxism. Environmentalism Main article: Animal welfare in Nazi Germany Nazi society had elements supportive of animal rights and many people were fond of zoos and wildlife. Roosevelt for military disarmament, provided the other nations of Europe did the same. A further 5,000 Sinti and Austrian Lalleri people were deported to the Łódź Ghetto in late 1941, where half were estimated to have died. Under Ernst Röhm 's leadership the SA grew by 1934 to over half a million members4.5 million including reservesat a time when the regular army was still limited to 100,000 men by the Versailles Treaty. Meanwhile, American and British bomber fleets based in Britain began operations against Germany. The law also permitted the Nazis to deny citizenship to anyone who was not supportive enough of the regime.