德国统一社会党
He belonged to the reformist wing of the governing Socialist Unity Party of Germany at the time of the pro-democracy transition inspired by then Soviet leader Mikhail Gorbachev. He has strongly denied allegations that he used to assist the Stasi, the East German secret police. He was the last leader of the Socialist Unity Party of Germany and led the effort that transformed it into the post-Communist Party of Democratic Socialism (PDS), forerunner of The Left.