You are correct, I was attempting to reference the style of WW2 Jewish ghetto such as the Nazis expanded/set up in Warsaw (though there were other similar ghettos in many cities).
Rory is correct that ANY homogenous semi-separate enclave can be labeled a ghetto, however. Part of the charm of the English Language. My allusion WAS meant to evoke the Nazi-codified ghettos of WW2.
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