I don't think the "curtain" designation is appropriate for the other power blocs because it's use didn't designate a power bloc nor was it simply describing the border defences and restrictions between east and west.
It was used to describe the notion that like a curtain in a window, we in the west could not see into the east and examine what they were doing. So the "Iron Curtain" label didn't signify the influence of the Soviet Union over the WarPact nations so much as it was a description of the restricted view of Eastern Europe we were able to get.
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