It is Fritz Tarnow (April 13, 1880-October 23, 1951) a German social democrat trade unionist. For a biography in german see the Friedrich Ebert Stiftung http://www.fes.de/archiv/adsd_neu/inhalt/stichwort/tarnow.htm Also a brief bio in english from the German Resistance Memorial Center http://www.gdw-berlin.de/bio/ausgabe_mit-e.php?id=84 From the marxists.org see Bela Kun's (1932) "Marxism Versus Social Democracy", Address delivered at Plenum Executive Committee of the Young Communist International http://www.marxists.org/archive/kun-bela/pamphlets/1932/12.htm For the source of the quotation see Laura J. R. Bradley _Brecht and political theatre_OUP 2006 at p. 32 Nicholas J. Theocarakis