Minnie Schreck — I have used Ancestry.com and MyHeritage.com to research ship manifests.  In Ancestry, you can narrow down the dates of immigration and you select the “Jewish” Collection, which should narrow down the spoken language to Yiddish.  MyHeritage.com Has a lot of Jewish and Israeli users … so there are a lot of Jewish family trees and lots of Jewish records.     Please let me know if you are also researching the Schreck family genealogy.