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Subjects
Labor unions
8
Forced labor
4
Convict labor
2
Political prisoners
2
Adult education
1
Concentration camps
1
Dissenters -- Soviet Union
1
Freedom of association
1
Industrial recreation
1
Labor and laboring classes
1
Labor laws and legislation
1
Penal colonies
1
Prisoners of war
1
Soviet Union
1
World War, 1939-1945
1