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He was transferred to Tambov to live independently under police surveillance , but soon fled again , whereafter he spent 1913-14 encouraging civil unrest in the cities of St. Petersburg , Kharkov , and Vologda ; relocated to Samara in 1917 ; and became President of the local soviet — a position he held at the time of the October Revolution and for the next year .
 Tambov, St. Petersburg, Kharkov, Vologda, Samara
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tambov, St. Petersburg, Kharkov, Vologda, Samara