Okhrana

The Department for Protecting the Public Security and Order (Отдѣленіе по Охраненію Общественной Безопасности и Порядка), usually called `guard department` (okhrannoye otdelenie) and commonly abbreviated in modern sources as Okhrana or Okhranka in Russia, was a secret police force of the Russia.....
Found on http://en.wikipedia.org/wiki/Okhrana

Okhrana

The Okhrana was the Tsarist Russian security and intelligence agency from 1881 to 1917. After the Bolshevik revolution, the Cheka modelled itself on the Okhrana which had successfully used penetration agents and agents provocateurs.
Found on http://www.probertencyclopaedia.com/browse/FO.HTM
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