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Leavitt played a pivotal role in the Amistad events , when on September 4 , 1839 , he and Lewis Tappan and Simeon Jocelyn formed the Amistad Committee to raise funds for the defense of the Amistad captives .
 Leavitt, Lewis Tappan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leavitt, Lewis Tappan