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From 1939 to 1942 Greenwood worked at the Ministry of Information where , in 1941 , he became private secretary to the Director-General , Walter Monckton , with whom he travelled to Russia and the Middle East .
 Greenwood, Walter Monckton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Greenwood, Walter Monckton