Stalin and the anti-darwinist Lysenko had many the darwinist scientists executed. This is also well documented. The result was a decrease in agricultural production during the 1930s. (Of course, killing the kulaks didn't help either.)
I think you're missing the point.
Stalin had a lot of Marxist/Leninists killed, too. That means Stalin was not guided by Marx and Lenin?
According to Yaroslavsky -- a Stalin sycophant -- Stalin credits "Origin of the Species" with inspiring him to abandon Christ.