What part of my statement are you denying:
A. Communism is based off of Dialectic Materialism?
b. Dialectic Materialism is based in Darwinism?
I'm actually baffled that this would even be a point of contention. This is not to say Darwin was a communists, or a Nazi either, (he's tied to them through the Eugenics movement). I have no idea if he would have approved of these associations or not. However, Darwin is the basis of Dialectic Materialsim
from:
http://pubs.socialistreviewindex.org.uk/isj71/darwin.htm
"The impact of Charles Darwin's theory of evolution was undoubtedly revolutionary. Marx's response to the appearance of The Origin of Species in 1859 is well known. In a letter to Ferdinand Lassalle he wrote:
Darwin's book is very important and serves me as a natural-scientific basis for the class struggle in history... Despite all deficiencies, not only is the death-blow dealt for the first time here to 'teleology' in the natural sciences, but its rational basis is empirically explained.2 "