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Longman Dictionary of Contemporary English
labour camp
noun
EXAMPLES FROM CORPUS
▪ A forced labour camp, they call it.
▪ Alexander Solzhenitsyn held much of his work in his mind while he was in a labour camp.
▪ Before you know it, you're freezing your boots off in a Siberian labour camp.
▪ The labour camp itself was supplied from the straits.
Wiktionary
labour camp

alt. A type of prison where prisoners are obliged to do forced labour, usually outdoors. n. A type of prison where prisoners are obliged to do forced labour, usually outdoors.