why wasn't stalin and his government brought to world court?

Stalin and his COMMUNIST government killed 20 million people, that's 9 million MORE killed then Hitler.

we always attack hitler for his genocide (as we should) but we ignore the atrocities committed by COMMUNISM!
why was stalin and his evil government not brought to world court and charged with the same crimes as Hitler? both commited acts of genocide. is it not hypocricy to attack one but not the other?

I believe it is because people want communism here in north america, so they ignore the fact that more have died under communism then under fascism. I don;t want to see either political systems take hold in my country, both are EVIL! and both parties are socialist. explains a lot.