277959
This attack occurred on the 17th anniversary of Meles Zenawi s overthrow of Mengistu Haile Mariam s former military government , the Derg .
 Meles Zenawi, Mengistu Haile Mariam, Derg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Meles Zenawi, Mengistu Haile Mariam, Derg