What set antisemites apart from anti-antisemites in Imperial Germany was not so much what they thought about 'the Jews', but what they thought should be done about them. Like most anti-antisemites, German Social Democrats felt that the antisemites had a point but took matters too far. In fact, Socialist anti-antisemitism often did not hinge on the antisemites' anti-Jewish orientation at all. Even when it did, the Socialists' arguments generally did more to consolidate than subvert generally accepted notions regarding 'the Jews'. By focusing on a broader set of perceptions accepted by both antisemites and anti-antisemites and drawing a variety of new sources into the debate, this study offers a startling reinterpretation of seemingly well-rehearsed issues, including the influence of Karl Marx's 'Zur Judenfrage' and the positions of various leading Social Democrats (Franz Mehring,