Question

Why was the iron curtain a problem

Answer 1

 It prevented the Allies from knowing what the Soviets were up to.

The Iron Curtain was an imaginary barrier that blocked the west from the east , it represents the Soviet's efforts to block contact from non-Soviet entities from the west.

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Answer 2

It prevented the allies from knowing what the soviets were up to.
I hope this is of help to you, and happy studying~!
~{Oh Mrs.Believer}