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Mikhail Ryumin ( September 1 , 1913 — July 22 , 1954 ) , Deputy Head of the Ministry for State Security ( Soviet Union )
 Mikhail Ryumin, Ministry for State Security ( Soviet Union )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mikhail Ryumin, Ministry for State Security ( Soviet Union )