| Clue | Source | Date |
|---|---|---|
| Political prisoner camps (6) | ||
| Acronym for penal colonies derived from the Russian for chief camp administration | The Guardian Weekend | 30 Oct 2021 |
| Soviet labor camps | Eugene Sheffer | 27 Jul 2021 |
| Stalin-era prisons | The Washington Post | 26 Aug 2020 |
| Stalin-era prisons | LA Times Daily | 26 Aug 2020 |
| Labor camps | Wall Street Journal | 26 Dec 2015 |
| Labor camps | ||
| Soviet labor camps | ||
| Prison camps | ||
| Prison camps |