Der Volksstaat was the central organ of the German Social Democratic Workers Party (Sozialdemokratische Arbeiterpartei Deutschlands). It was published in Leipzig from October 2, 1869 to September 23, 1876. It was edited by Wilhelm Liebknecht, with help from Karl Marx and Friedrich Engels. They also contributed to the newspaper as did many other socialists including Joseph Dietzgen.
Source - MIA Glossary of Periodicals