OGPU
| Date | Clue |
|---|---|
| 2008-10-05 | Forerunner of the K.G.B. |
| 2008-03-30 | K.G.B. predecessor |
| 2007-06-10 | K.G.B. predecessor |
| 2002-10-06 | Old Soviet secret police org. |
| 1995-03-24 | K.G.B. predecessor |
| 1994-04-03 | Old Russian secret-police org. |
| 1994-03-10 | Lenin's police org. |