From the annals of paranoia – during the Cold War, large parts of the US was off limits to Soviets:
If you were one of select few private Soviet citizens granted permission to visit the United States in 1955, you could take in a Cubs game or ski Jackson Hole, but if you wanted to sample Memphis barbecue or check out the factories in Youngstown, Ohio, you’d be out of luck. That’s because a National Security Council directive had, on Jan. 3, 1955, allowed some “Soviet citizens in possession of valid Soviet passports” into the country, while extending controls previously placed on visiting Soviet diplomats and official representatives to apply to their travel.
This map shows where Soviet citizens, who were required to have a detailed itinerary approved before obtaining a visa, could and could not go during their time in the United States. Most ports, coastlines, and weapons facilities were off-limits, as were industrial centers and several cities in the Jim Crow South.
The Dish 