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He was a key entity in the conversion of the Popular Front 's militias into a disciplined standing army , the Spanish Republican Army , able to fight Franco 's Nationalist Front .
 Popular Front, Franco 's Nationalist Front
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Popular Front, Franco 's Nationalist Front