- Trade-unions--United States--History (19)
- Labor and laboring classes--United States--History (5)
- Collective bargaining--United States--History (3)
- Labor movement--United States--History (2)
- Working class--United States--History--20th century (2)
- Alien labor--United States--History (1)
- Capitalism--United States--History (1)
- Class consciousness--United States--History (1)
- Conservatism--United States--History (1)
- Ethnicity--United States--History (1)
- Extortion--United States--History (1)
- Industrial relations--United States (1)
- Industrial relations--United States--History (1)
- Labor laws and legislation--United States--History (1)
- Labor leaders--United States--History (1)
- Labor policy--United States--History (1)
- Minorities--United States--History (1)
- Racketeering--United States--History (1)
- Skilled labor--United States--History (1)
- Trade-unions and communism--United States--History (1)
- Trade-unions--Law and legislation--United States--History (1)
- Trade-unions--United States (1)
- Union busting--United States--History (1)
- United States--Emigration and immigration--History (1)
- United States--Social conditions (1)
- Working class--United States--History (1)
- Working class--United States--History--19th century (1)