Thanks, Martin! 

This was very helpful, and answered a question that had long gone unanswered.

My maternal grandmother's sister, Lena Lundin/Lande came to the US first from Bialystok.  The person to whom she was going in Chicago (listed on her passenger manifest) was Harry Lapinsky, who I have now discovered was a key founder of the Chicago Bialystoker Landsmanschaft.  He probably sponsored many other Bialystokers who did not have relatives in the US yet.

Deb(orah) Cohen Skolnik
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SEARCHING:  KISSIN/KISIN (Vitebsk),
LIFSCHITZ/LIFSHITZ/LIPSHITZ (Vitebsk, Belarus),
ZOLOTUSHKIN (Jahotyn/Yagotin, Poltava),
GARBARZ (Mordy, Ostrow/Ostrova), LANDE/LANDY/LONDIN/LUNDIN (Bialystok)