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The Cheka detachments stationed in Kyiv reportedly would attach an iron tube to the torso of a bound victim and insert a rat in the tube closed off with wire netting , while the tube was held over a flame until the rat began gnawing through the victim 's guts in an effort to escape .
 Cheka, Kyiv
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cheka, Kyiv