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In page Anna of Russia:

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Anna resurrected the Secret Office of Investigation, whose purpose was to punish those convicted of political crimes, although some cases were occasionally taken that were not of a political nature.[1] It has been rumored since Anna's reign that Biron was the power behind the Secret Office of Investigation when in fact it was run by the senator A. I. Ushakov.[citation needed] The punishments meted out for the convicted were often very painful and disgusting. For example, some people that had supposedly been plotting against the government had their noses slit in addition to being beaten with the knout.[2] Russian authorities listed a total of around 20,000 Russians—including some of the highest native nobility—who fell victim to Biron and Anna's police.[3]