Reddit reviews How Hockey Saved a Jew from the Holocaust: The Rudi Ball Story (The Legends Series)
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And /u/SenorPantsbulge did a past piece on him.
https://www.reddit.com/r/hockey/comments/3ril2i/wayback_wednesday_rudi_ball_and_the_nazis/
EDIT: I recommend Ball's book as well.
https://www.amazon.com/How-Hockey-Saved-Jew-Holocaust-ebook/dp/B007AQB4T8