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It tells the story of Joseph Valachi , a Mafia informant in the early 1960 s who was the first ever mafioso to acknowledge the organization 's existence .
 person: Joseph Valachi; organization: Mafia
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Joseph Valachi; organization: Mafia