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In the 1980 s , Médecins Sans Frontières , the international medical charity , supplied photographic and other documentary evidence of ritualized cannibal feasts among the participants in Liberia 's internecine strife to representatives of Amnesty International who were on a fact-finding mission to the neighboring state of Guinea .
 Médecins Sans Frontières, Liberia, Amnesty International, Guinea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Médecins Sans Frontières, Liberia, Amnesty International, Guinea