While she was the youngest member of the Werkbund in 1928, Kurt Schwitters introduced her to the Bauhaus architect Robert Michels in Frankfurt.
Translated as Sexual Ethics: A Study of Borderland Questions (Walter Scott, George Allen & Unwin, Charles Scribner's Sons, 1914); republished with a new introduction by Terry R. Kandal (Transaction Publishers, 2001-2, ISBN 0-7658-0743-2)
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In 1911 Robert Michels first proposed the Iron law of oligarchy, which described the development of bureaucratic hierarchies in supposedly egalitarian and democratic socialist parties.