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Female activists of this period included Alice Hamilton , Jane Addams , and Ellen Swallow Richards who brought to the forefront issues of pollution , urban degradation and health hazards .
 Alice Hamilton, Jane Addams, Ellen Swallow Richards
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:
 Alice Hamilton, Jane Addams, Ellen Swallow Richards