 In October 2003 Hundstorfer became Vice President of the Austrian Trade Union Federation.On 27 March 2006 he took over "ad interim" the ÖGB presidency after the resignation of Fritz Verzetnitsch during the BAWAG affair.He remained president ad interim until the election of his successor Erich Foglar from OGB Board, when Hundstorfer had already been designated to Minister of Social Affairs and Consumer Protection in the First Faymann government.