Why did marx and engels scoff at those who denounced communism as inimical to freedom?

Marx and Engels scoff at those who denounced communism as inimical freedom because these people who did scoff at the manifesto were a part of the upper class. Communism was made to promote the working class and take away the insistent power that the upper class had (especially the bourgeois). 

The Iron Curtain was not actually a physical wall in most places, but it separated the communist and capitalist countries. The Berlin wall on the other hand was actually a wall that was built right through the middle of Berlin the capital of Germany.

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