37667
Detractors criticize him for a series of political repressions which included the establishment and use of forced labor camps , extrajudicial killings and executions that targeted and eliminated dissidents , a large number of which were carried out by the Sigurimi secret police .
 Sigurimi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sigurimi