Sorry, but why should I read something from the bourgeois factory owner Engels, or from his bromance buddy Marx, who lived from the surplus value Engels extracted from his proletarian workers?
Marxist theory, having been written by two members of the bourgeois class, cannot but be just another false consciousness ideological construct to advance the interests of the bourgeois themselves, as is evidenced by the fact over the last 150 years it has led to nothing but the overcoming of one set of bourgeois by another set of bourgeois, the so "avant-garde of the proletariat", which in typical fashion always have everything but actual proletarians.
Wake up. None of these "avant-garde" bourgeois will ever transfer their dictatorial power to the actual proletariat. As all bourgeois ideologues, they want the power for themselves. The proletariat? Convenient excuses for the power grab, if that much.