It was said that one of Marx’s most powerful insights was that even the most successful and beneficial systems and institutions carry within them the seed of their own destructions and the trade union was a social response to the advent of industrialization and capitalism. Does unionism constitute the seed of destruction of capitalism? This puzzle was pursued in this article which was carried out with the doctrinal method. It critically reviewed the Marxist conflict model and its prognosis for unionism under capitalism, socialism and communism and determined whether unionism was the grave digger of capitalism. The researched relied mainly on content analyses of secondary resource materials namely: opinions of text writers. It found that even as unionism was a significant historical weapon in the arsenal of Marxist revolutionaries it did not become defining. Much as it was relied upon by socialists as an instrument of transformation of the society under socialism and communism, unionism remained blunt in remnant capitalism and transformed into corporatism