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In May 1991 , a coalition of rebel forces under the name Tigrayan People 's Liberation Front ( TPLF ) overthrew the dictatorship of President Mengistu Haile Mariam .
 Tigrayan People 's Liberation Front, TPLF, Mengistu Haile Mariam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tigrayan People 's Liberation Front, TPLF, Mengistu Haile Mariam