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 Removed "without papers" reference. Urban Dictionary is not a source. Even less is it a source of anything period. Although it is certainly possible that this was a source of the term, there is absolutely Zero documentation for this origin, no citation to any authoritative or historical usage given.  Maghnuis   

 Wop was used as a term for any labor "that did not matter" in the beginning of the 20th century. If they got wopped   — Preceding unsigned comment added by     

 The term WOP does mean with out papers. I know some history revisionists are trying to claim that it doesn't but it does. Many Italian immigrants arriving did not have proper documentation of their citizenship, so the term WOP was dubbed. The idea that the term has its roots in the Italian term guappo lacks credibility as it is unlikely that Italians would use a word to disparage all Italians, and Americans in New York in the early part of the century, where and when the term originated. Immigrants to America were asked to provide their documents upon arrival to America, prior to 1921, as this link from Ellis Island proves. As such I am going to edit the article, where it says that documents weren't needed. 
 http://www.ellisisland.org/genealogy/ellis_island_history.asp 
    

 : "The term WOP does mean with out papers." Citation needed.    
 ::Miriam Webster is definitive.  There is no question about that.  Enough of the revisionist racist bullshit.    

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