3930
By the end of 1955 , thousands of political prisoners had returned home , and told their experiences of the Gulag labor camps .
 location: Gulag
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: Gulag 
Answer:
 location: Gulag