This thinker distinguished between different kinds of emancipation in his work On the Jewish Question. In his Contribution to Hegel's Philosophy of the Right,  he described a 
This thinker distinguished between different kinds of emancipation in his work On the Jewish Question. In his Contribution to Hegel's Philosophy of the Right,  he described a certain cultural practice as "the sigh of the oppressed creature", before stating that "religion is the opiate of the people". He critically analyzed the system of capitalism in his Das Kapital. For 10 points, name this German philosopher who most famously co-authored The Communist Manifesto with Friedrich Engels.
This thinker distinguished between different kinds of emancipation in his work On the Jewish Question.
Karl Marx