Lothar Bisky (17 August 1941 – 13 August 2013) was a German politician. He was the chairman of the Party of Democratic Socialism (PDS), the successor of East Germany's Socialist Unity Party (SED). In June 2007 he became co-chairman of the The Left (Die Linke) party, formed by a merger of the PDS and the much smaller Labour and Social Justice – The Electoral Alternative. From 2007 until 2010 he was the President of the Party of the European Left.