What are the two types of labor unions

There are two types of unions: the horizontal union, in which all members share a common skill, and the vertical union, composed of workers from across the same industry.

horizontal union and vertical union

Explanation:

There are two types of unions: the horizontal union, in which all members share a common skill, and the vertical union, composed of workers from across the same industry. The National Education Association (NEA) is the largest labor union in the United States, with nearly three million members