The underworld- the criminal/immoral side of life on the island

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Dear all,
A man from Staten Island is speaking on the phone saying:
"I got a call from a friend of mine who knows the Russians from the dark side of the island."
What is the meaning of "the dark side of the island"?
Thanks a lot.
The underworld- the criminal/immoral side of life on the island
Can't thank you enough![]()
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