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Subjects
Labor unions
14
Forced labor
11
Labor movement
11
Communism
7
Concentration camps
6
Communists
3
Labor
3
Labor laws and legislation
3
Political prisoners
3
Agriculture
2
Environment protection
2
Forced migration
2
Labor and laboring classes
2
Poland
2
WWII
2
World War, 1939-1945
2
Air defense
1
Baikal-Amur Mainline
1
Civil defense
1
Cosmology
1