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It was sung in 1923 at the rally in Leningrad against the Curzon Line , the " British seas " acquiring new significance in view of Lord Curzon 's ultimatum .
 Curzon, Lord Curzon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Curzon, Lord Curzon