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His main supporters were the 2nd secretaries of the Communist Party ( Yuri Melkov ( until 1973 ) , Nikolay Merenishchev ( 1973-1981 ) , who came from Russia and the KGB , whose chairmen were Ivan Savchenko ( until 1966 ) , Piotr Chvertko ( 1966-1974 ) and Arkady Ragozin ( 1974-1979 ) .
 organization: Communist; location: Russia; organization: KGB; person: Ivan Savchenko; person: Piotr Chvertko
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Communist, Russia, KGB, Ivan Savchenko, Piotr Chvertko 
Answer:
 organization: Communist; location: Russia; organization: KGB; person: Ivan Savchenko; person: Piotr Chvertko