| Labor unions -- United States -- History -- 20th century. Matches 8 items |
| Labor unions -- United States -- History -- 20th century -- Case studies. Matches 1 item |
| Labor unions -- United States -- History -- 21st century. Matches 2 items |
| Labor unions -- United States -- History -- Sources. Matches 1 item |
| Labor unions -- United States -- Management. Matches 1 item |
| Labor unions -- United States -- Membership -- History -- 20th century. Matches 1 item |
| Labor unions -- United States -- Officials and employees -- Biography. Matches 1 item |
| Labor unions -- United States -- Pictorial works. Matches 1 item |
| Labor unions -- United States -- Political activity. Matches 2 items |
| Labor unions -- United States -- Political activity -- History. Matches 3 items |