Doesn't matter how something sounds, but what it does.

Communism has never been achieved i suppose it could be blamed for causing the revolution which allowed stalin to take power.

If your talking stalinism which i strongly suspect you are im willing to argue pure numbers would show facism to be a far deadlier ideaology, you have to take into account length of rule and population available to kill, of course this isn't even taking into account all the lives lost because of world war 2.