The crossword solution for the term 'Capital Fellow' is 'Marx'. Karl Marx was a German philosopher, economist, historian, sociologist, political theorist, journalist and revolutionary socialist. He is best known for his influential works, The Communist Manifesto and Das Kapital, which are considered to be the foundations of modern communism. Marx's theories about society, economics and politics, collectively known as Marxism, had a profound influence on subsequent intellectual, economic and political history.