Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Social conditions.
Labor unions and communism--Europe, Eastern.
Labor unions and communism--Poland.
NSZZ "Solidarność" (Labor organization)
Poland--Social conditions--1945-
Strikes and lockouts--Europe, Eastern.
Strikes and lockouts--Poland
Princeton subject headings:
Europe, Eastern--Politics and government--1945-
Working class--Europe, Eastern.