What was the purpose of the secret police?

Related questions

1. Who found it necessary to use secret police?
2. Who was punished in the Great Purge and how?
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4. Why was Marie Antoinette killed?
5. What was Russian secret police called?
6. Who was the leader of the NKVD?
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Tags

1. #weaken
2. #police
3. #always
4. #outside
5. #torture
6. #secret
7. #often
8. #dissidents
9. #individual
10. #political
11. #authoritarian
12. #repress
13. #protect
14. #power
15. #opposition
16. #operate
17. #regime
18. #assassinations
19. #dictator
20. #violence
21. #frequently