Over the course of the German Empire the Social Democrats went from being a vilified and persecuted minority to becoming the largest party in the Reichstag, enjoying broad-based support. But this was not always the case. In the 1870s, government mouthpieces branded Social Democracy the party of assassins and conspirators and sought to excite popular fury against it. Over time, Social Democrats managed to refashion their public image in large part by contrasting themselves to anarchists, who came to represent a politics that went far beyond the boundaries of acceptable behavior. Social...