| Clue | Source | Date |
|---|---|---|
| Soviet WWII counterintelligence | The Chronicle of Higher Education | 02 Dec 2016 |
| Soviet WWII counterintelligence | ||
| 1940s Soviet secret police org. | ||
| 1940s USSR secret police | ||
| WWII U.S.S.R. secret police | ||
| WWII USSR secret police | ||
| WWII USSR secret police | ||
| 1940's Soviet secret police org. |