also: ラーゲル
noun
gulag; Soviet labor camp
Historical term referring specifically to Soviet forced-labor camps, not generic prison camps. Used in contexts discussing Soviet history or literature.
from Russian lager'
彼の祖父はスターリン時代にラーゲリに送られた。
His grandfather was sent to a gulag during the Stalin era.
ソ連のラーゲリに関する記録が公開された。
Records about Soviet gulags have been made public.
強制収容所 is a broader term for concentration camps, not limited to Soviet ones.
Borrowed from Russian лагерь (lager'), meaning 'camp', specifically associated with Soviet forced-labor camps.