These ideas are most closely associated with no other than Karl Marx. He brought about this idea in his seminal work called the Communist Manifesto, where he talked about various things pertaining society and class struggles. Among them he also develope dthe notion of the dictatorship of the proletariat where the proletariat would have all the political power in a new type of society.
John Wilkes Booth, a confederate sympathizer
It would be "psychology" and "philosophy" and "psychology" that have Greek origins, although it should be noted that several sub-disciplines of these forms have other origins.
