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During the late 19th century and early 20th century , a movement involving the advocacy of social justice feminism began in the United States under Florence Kelley .
 United States, Florence Kelley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United States, Florence Kelley