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Origin of the term Blue Sky in a securities context Its earliest cited use by the United States Supreme Court was in an opinion by U.S. Supreme Court Justice Joseph McKenna in Hall v. Geiger-Jones Co. , 242 U.S. 539 ( 1917 ) , a case that addressed the constitutionality of state securities laws .
 Joseph McKenna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Joseph McKenna