Sadly, I've had no progress to report since my last post.
I filled out a missing persons page for each of my relatives that went missing after 1917 and gave it to the Red Cross. After a few months, I was notified that since I personally never met any of these people, they consider this a genealogy search and can not provide further assistance. My research has now hit another wall, it seems.
However, while watching a story about Twitter on CBS Sunday morning, I began to wonder if I could use Twitter's global network to find and connect with our Zvolanek family overseas. Maybe if I learn more about Twitter and ways to use it, I can discover what became of our family. Maybe someone in the Ukraine, Russia, Czech Republic - or someplace completely unexpected - will see this photo and recognize the family of Jan Zvolanek Sr.