What does it mean: ... keeps pulling the grapevine ... shakes down at least a few grapes.
In the words of an old Amercian saying, the person who keeps pulling the grapevine shakes down at least a few grapes.

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Answer

Pure English slang.  The grapevine is slang for rumors.  (Ideas circulated behind the scenes) so by shaking the grapevine a few of the rumors were exposed to the public or became known.

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