[Dimensio]

This source doesn't quite note the outlawing of Darwinian teachings, but does point out that Stalin outlawed the teaching of genetics.

And here is a site discussing Lysenkoism and how dogmatic adherence to it -- brought about through Stalin's orders -- led to a steady decline in the Soviet's biological fields.

As for what Lysenkoism is, you can check here to see that it is not compatable with Darwinian evolution. Key quote "It was due to Lysenko's efforts that many real scientists, those who were geneticists or who rejected Lamarckism in favor of natural selection,"

[johnnyb_61820]

So what you're saying is that while Stalin reject Darwin's Theory of evolution, he mandated evolution itself. I'm going to make a wild guess that the reason for outlawing genetics is the fact that Mendel used it to show that evolution was false.