Texas Organized Labour portal See also: Category:Trade unions by century of disestablishment Subcategories This category has the following 4 subcategories, out of 4 total. 0–9 Trade unions established in the 18th century (2 P) Trade unions established in the 19th century (10 C, 2 P) Trade unions established in the 20th century (10 C) Trade unions established in the 21st century (3 C)