What is the main conflict in The Communist Manifesto by Friedrich Engels and Karl Marx?

The first part of the document considers the antagonistic relationship of the bourgeois and the proletariat. The philosophy is somewhat abstracted but also features historical examples and presents a brief but intelligible recounting of the socio-economic forces which led to the dissolution of feudalism and the establishment of the bourgeoisie. The second part of the document considers the supportive relationship of the proletariat and Communism. This section is predominantly concerned with apologizing to many of the theoretical attacks against Communism then obtaining. It also seeks to establish as fact the benefits to the proletariat of wholesale adoption of Communist thought. This second part of the document concludes with a list of demands espoused by Communists. It is the contemporaneous segment of the document and many later prefaces expanded or clarified the principles discussed.