...
Internationally, Stalin was given a pass:
with the help of many sympathizers abroad
. Hitler was confronted with voices of criticism and outrage. This at a time when the deaths attributable to Stalins policies were infinitely greater than those attributable to Hitlers.
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Hitler and fascism in general were supported in the beginning by the west too, especially business. Up to 1938 or 39 you still had American diplomats saying Hitler wasn't all bad, just misunderstood.