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Until the Sixties, drugs was a small but profitable part of every family's income. Yes, most of their income came from gambling, etc., but the drug profits were too good to pass up. As long as the traffic was confined to racial minorities, jazz musicians and others that society didn't care about, the law was pleased to look the other way in return for bribes.
You just reminded me of that scene in the Godfather but said it in a nice way