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The forerunner of the League of Nations , the Inter-Parliamentary Union ( IPU ) , was formed by peace activists William Randal Cremer and Frédéric Passy in 1889 .
 Inter-Parliamentary Union, William Randal Cremer, Frédéric Passy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Inter-Parliamentary Union, William Randal Cremer, Frédéric Passy