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In page Gulag:

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Persons who served a term in a camp or prison were restricted from taking a wide range of jobs. Concealment of a previous imprisonment was a triable offence. Persons who served terms as "politicals" were nuisances for "First Departments" (Первый Отдел, Pervyj Otdel, outlets of the secret police at all enterprises and institutions), because former "politicals" had to be monitored.[citation needed]