Gulag

A Gulag was a type of prison that was noted for its brutal, repressive nature and lack of modern features.

The term Gulag originated in the Union of Soviet Socialist Republics on Earth, and was an acronym for the Russian term Glavnoye Upravleniye Lagerej, or forced labor camp administration.

Non-Earth based Federation penal colonies were lacking in modern amenities, but were much better when compared to Klingon gulags. 

Starfleet Captain Jean-Luc Picard once compared the Angosian penal settlement Lunar V to an orbital gulag.